Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f77cd2c348809f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 16:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4b7fe5baf1201066b3f0966165a8862 SHA-1: a6651181ddf0cd1f0404ae512c23340180f2f073 SHA-256: f7f77cd2c348809f2d932756e5671fd15e83bcb647d5442d2cf195359142ae6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://archism.ru/uplcv?utm_term=japanese+short+stories+for+beginners+pdf PDF link annotation
    • http://mskgroup-spb.ru/upload/file/namudugakolurajusexewi.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/32568280839.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/jixot.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/98625846978.pdfIn PDF document text
    • https://irantruck.ir/data/file/parikekuxavozebe.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/fefegininisu.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61440C5F10027.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/nisegetar.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/40928718624.pdfIn PDF document text
    • http://imbirimbir.ru/files/12323378953.pdfIn PDF document text
    • http://techbis.pl/files/file/72476668953.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d1c0f08f78650ed2b8c96c82a0fb816d/nadenepaluwaxe.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/dovilumumutal.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/zonofoma.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/nagiwoz.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210916164617_8x1pgy.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/13130758075.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/maxowelebenubobi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a620ca1e29---56941885798.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/xapilowotu.pdfIn PDF document text
    • http://pileki.com/imgup/file/19952383516.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/wilutimukosu.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/ribinudedebuvajawo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614392211c910---78852807673.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6f6b2c1fbe032867e6b1c43203c3474d/70931611701.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_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 18260 bytes
SHA-256: 268bd81c0004603ad66b37d00221092cb9df71bcd2af796ad61335662af8a8f9
font_01_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 10860 bytes
SHA-256: b6053e744b65318d7994c556f7c669dd2b49256442bc5387d264609820659f9c

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