Malicious PDF — malware analysis report

Static analysis result for SHA-256 619b9738df4df207…

MALICIOUS

PDF

95.5 KB Created: 2021-09-13 04:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e7dc286d0f49867b36d9bb8e0f1c138 SHA-1: 9cc2081b1448730d26c5651260bc8622c55a86a4 SHA-256: 619b9738df4df20789acba9868a2cdc5db4dda5da4557dd4f7cda30ce650d3e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate redirection or exploit vulnerabilities. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://smidgel.ru/uplcv?utm_term=android+min+sdk+16 PDF link annotation
    • http://sicilalluminio.it/userfiles/files/texeresonepusixegiboromuf.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/gurudul.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/tusevozitemoxukagosu.pdfIn PDF document text
    • http://bulmarconsult.com/files/40791828868.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/og55asfruv68ga2tg98helm2c5/79417645010.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/xosaseboxe.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/9511718184.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/rejemetijubepojoxamu.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/jafisakemeti.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e165e5fdad046ead2a337f554d5832b8/13762198953.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/bozujegi.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/pimemobufatigajira.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/011354347695.pdfIn PDF document text
    • http://badgerhillfarm.uk/kumim.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161334850c21e3---56045940193.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6488043470.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/98231726011.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/83297142408.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/46020338576.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/xevefozujule.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1823a6ad---29650656384.pdfIn PDF document text
    • http://videocycling.info/files/file/xajasu.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/22417715004.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/xatubanopoxi.pdfIn PDF document text
    • https://curvy.tw/upload/files/91306797090.pdfIn PDF document text
    • http://polipack.ru/content/file/setefanabukozozina.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/boxozatewenujeno.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_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 18124 bytes
SHA-256: 0ad5a30909d2cdc23db83143fa5e91d27b4ce50384764e6e092f2bf819eb0c85
font_01_sfnt_off000140cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CF 10264 bytes
SHA-256: 86528171028305f79a1b7e4103ef360304107dc6ba6a0450cc725fbdfabdb8be
font_02_sfnt_off000157df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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