Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef2cfc2175f7b21…

MALICIOUS

PDF

93.1 KB Created: 2021-07-06 22:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe28fe6072075aa31fd79938f4a03d01 SHA-1: f45c39df45e6417a660d699ae36964c4c5de28bd SHA-256: 3ef2cfc2175f7b21f8fd46556fd213f65db7236ecbf6552efdbc918e0e714173
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites. These links are likely intended to redirect users to malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608de6095e4f7---votajeluzepovutofe.pdf
    • http://mazdooradda.com/userfiles/file/93243036145.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/8m3vtfaoqunhfq39j5i7tev2kg/37392307389.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2231cf99f---zogadisipobezizezivafugoz.pdf
    • http://av-jet.ru/userfiles/file/wevonepiritadedumajapolav.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c114fa03e84---34842618828.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/984n2sf52h03a8e4oanbv4fvrv/velezerawuzobeki.pdf
    • http://ottotech.center/userfiles/file/jiverifan.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/107fda2c96f29ee85064363a20eb9cc3/43797824251.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/30284797996.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/jabozewukepitu.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/18962579405.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11fea38414---derofabaliwilalulexab.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099c3c7553d9---kowilurulizu.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d440c9b20---21911531217.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4rej9d10m2n06972c0dgvjhj8c/80149818676.pdf
    • http://desushibar.com/userfiles/file/94966892748.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m85lbb441ru0d08bntm90165gq/50379000338.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160774fe166458---bogifaril.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085036b649e7---5645997182.pdf
    • http://atenngo.com/admin/sites/site/documents/94231916963.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f64cc06c92da907c500c63fdf103320c/pudukumoj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=apa+student+title+page+7th+edition
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010977.bin
dd0aa37d1509b2751b8658cf93015be20bf6e0bb41dc96393d1d7703f907720b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 10700 bytes
font_01_sfnt_off000121d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 16792 bytes
font_02_sfnt_off000139ea.bin
99dab018d42edf943e19c37bb8809623c0b179cdc54c1630dbdce390b34a2436
pdf-font-stream PDF embedded font (sfnt) at offset 0x139EA 17364 bytes