Malicious PDF — malware analysis report

Static analysis result for SHA-256 d563155aa7bad796…

MALICIOUS

PDF

85.5 KB Created: 2021-09-03 08:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0e769b38a4361175c82f64c904c11b64 SHA-1: 5f20c4267c58a7db6567b24dcb12f90cca0ad2dd SHA-256: d563155aa7bad796657fcb400e2036144d8619be8666b0e027bac75d92cf18bc
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

This PDF document exhibits multiple indicators of malicious intent, including being flagged by a machine learning classifier and ClamAV as a phishing/trojan. It employs social engineering lures, specifically encouraging the installation of browser extensions or plugins, and also presents a callback lure consistent with tech-support scams or advance-fee fraud. The document contains numerous links to potentially compromised websites and disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://khotelmarket.com/FileData/ckfinder/files/20210805_10802656D79A7B73.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e8075f42f---kusijiwefu.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/masowijosekagavun.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/86429819114.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/11141777054.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/buwetovonolejiramix.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/jenaterodu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b0990a16---33268190362.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/56290409822.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///9127645497.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6a35a3fa91d163c1290f53c276f722b2/wujibosixefapuzafovo.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/45641660268.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/kutebosubugukepedinixu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a599e919a20---75539289699.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/voxikunela.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/529069ac309ca93d1cf2e5eb743d4457/sunimabizofufuxubupopob.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/lolagetekamawokixabasof.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/073a39ca0c8669f4963fb88333a3e4d2/87404120399.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/vevizewegonawa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4r26mll545v6bjc5s5pqtbfod2/fizotidu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/48363358359.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee55d5c86f---55151619795.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/17746617013.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/48687411656.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcecf810b8---zuzuropibugupadibezevuk.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210822151009113.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/pudotepovupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=idbi+bank+rtgs+form+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 10976 bytes
SHA-256: c7d382cee32741cfcd16f7e84738f98214e6e5121bf85c24b7b4eecdcc7a1986
font_01_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 17752 bytes
SHA-256: 77ca76eea1a442bc2c453c4219f6125ff048060399eb91530db6da33a0e8d01d

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