Malicious PDF — malware analysis report

Static analysis result for SHA-256 309d9b0b88f48672…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 06:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a88c2333fe96e3500c45733eea965312 SHA-1: 8b3de68fda7855bd481b176222730d21cda756eb SHA-256: 309d9b0b88f4867277646749973cc78a0fdb52b39102c90180ee6a80b8b3400a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised or disposable hosting, suggesting an attempt to obscure the true destination or leverage SEO tactics. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the suspicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/f727f5dc759b9c193b46a77eb0289fd5/davorigipilusixofe.pdf In PDF document text
    • http://hbisan.com/userfiles/file/22554276435.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/9ai6nnp3q6tekk3v5ppvcgfjl1/75129438610.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/dekewi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f7ef7d960---pamijinosugijum.pdfIn PDF document text
    • http://rjt1.org/upload/files/jukep.pdfIn PDF document text
    • http://riversedgefm.com/files/file/29360970233.pdfIn PDF document text
    • https://cooperspick.com/files/bisej.pdfIn PDF document text
    • http://makaroma.fr/upload/file/rosaj.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/76703152959.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/lizisenigubowidibonok.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/g2gqqrlp8oilsqfnbakk05im2r/39575340333.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/mubixeju.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/aiin90hoa9vb6u5pusem0kf0d2/tapafekedojavojenatudokel.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914b3e73324---bigebuwedufizamu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d2eff4d65fbeb481e51a138a6ca6ee83/66973427453.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/vodevuxiru.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/simegixugexopabirij.pdfIn PDF document text
    • http://alptw.com/images/files/xituzutevanozumizakuki.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/paxaduwelumavizerilo.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/fulexalizabuduzabo.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/29975597854.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160948eb7b7b41---zemomawovelowusowasap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+sex+in+the+biblePDF 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_off0000c10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 15932 bytes
SHA-256: 7951870d5bdce63b0aec1faf7b3cfea838add7a0250047ab701ed2cafa594c9e
font_02_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 10220 bytes
SHA-256: 48ebd3d93b789a4346b09aed5c6ed6dc7d872f683bdf6d614e12ec5276bc9ea9

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