Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81494b10d12bd01…

MALICIOUS

PDF

95.9 KB Created: 2021-07-25 12:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 54e7907de09ee8c8dd02718e00d39336 SHA-1: 096d5ee448dc92c982feded855c0baba0b1bb5fa SHA-256: d81494b10d12bd0141966da329ebb1f9c5f513f10fa454f1cc8d70aa0ae7c4fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://extintoresorigen.com/images/editor/2068448301.pdf In PDF document text
    • https://vegas-shop.net/uploads/files/15069934288.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b881fa096f---gamijatizisodim.pdfIn PDF document text
    • http://fedime.org/imagenes/10857657206.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/808a53a7a87b941f9525b182b025f9cc/kimugetowutosuzagebin.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/56307110043.pdfIn PDF document text
    • http://luatsuphutho.com/upload/ck/files/zorusonolajubazemo.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/gikiri.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca893ff77---dotemalusugekugawejezog.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45466914c3---40037808054.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af674e5b08a---gavonatitax.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/vugatubokipugedawa.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/a8a93ca654bfa18c87ce9160c9f7201a.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9759a65fac---67832091319.pdfIn PDF document text
    • http://billsky.ee/files/file/mipuzudejojipomopinutun.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f988a3fdfd---96512867971.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071c5742ad74---pevosebirar.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9a33ad02e89a64cf3c7946ee31419edf/97647781677.pdfIn PDF document text
    • http://cpils.com/userfiles/file/kisavoniduv.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/mavoxetujetiku.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/watuxowem.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/2d5d2edaf5eed3a873967b6afa9d3edf/17410578852.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3f53504e---96013645197.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/20071431524.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b942b0dad49---34146160162.pdfIn PDF document text
    • https://scriptdd.com/_file/file/84404419303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=clash+royale+free+epic+chest+hackPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/50dfaca31bc63df28264e1f5c4f31f0b/53625407312.pdfIn PDF document text
    • 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_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 17068 bytes
SHA-256: e4e533c9a160be671bfd21cd8a241cc022473d20b923359e37d3d63d3043c587
font_01_sfnt_off0001400a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 10708 bytes
SHA-256: ede1fb1202bd4f995f181ce14b50591686b864cb8a963abcdabc708bb6228401
font_02_sfnt_off000158d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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