Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86964b3dda89675…

MALICIOUS

PDF

92.7 KB Created: 2021-07-13 12:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63b2798a24f3578ae039bc4161bc3da5 SHA-1: c88f6e12ab2042c1975e16de9b0b5bb1958b927f SHA-256: a86964b3dda896751d41940d5357d68f9e3cb1b41da3ed8c8dde7488c66aa3c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, with several pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://www.deco-interieure.com/userfiles/file/lasovojawujerisatifu.pdf In PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/k057levouve0paqm8epuevlse3/36926782014.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/56546406976.pdfIn PDF document text
    • http://armanetti.com/images/15655883238.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/58pbjakg3tjn8tt359kh1f90gv/zogebana.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/vokamazu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57c5fa6466---28760244834.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e5687d6d2---87238213394.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609acdff219e9---32630119880.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/166b6622375660953963cc1d959aeb64/38229453216.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6dshubnn378cltckdgqeglk5t6/fivazatutegiko.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/vevegisavadobos.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e8e945df9---xerolipifajizate.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dce51bc95---82122359968.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/57700219675.pdfIn PDF document text
    • http://contextuae.com/resimler/files/kosulunubifebaroxapizi.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a8ec52e646228a7a667b2eb933ba81b1/49816596653.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/29182549467.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/4002192738.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/57500479819.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607614596cc5b---97474787387.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/dubefubufegidanepive.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2bcd1b6f---68468967030.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/wuzakufivoti.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf991366c7---kifumotugubeditux.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/febib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=personal+history+statement+sample+essayPDF 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_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 10632 bytes
SHA-256: 3d0f788d71c85a11ceb549e6122be53cdbc8f4f372f4eb587127c671f2b05934
font_01_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13942 17016 bytes
SHA-256: fce40dfc68a21861c6231c3db50decec5b0f9674fc7ae5b88ab77d12152f9927

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