Malicious PDF — malware analysis report

Static analysis result for SHA-256 7490e4eb7ddfefdf…

MALICIOUS

PDF

154.6 KB Created: 2021-06-25 21:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9632d6e22fdcdea5ef7f3e57b1428c6 SHA-1: 995671e81cd8eee878d2ca010a6d3c05da90782d SHA-256: 7490e4eb7ddfefdf6f0f546f2ad5a9aa9bf410851aebeaef84c08046b990cde5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

Heuristics 6

  • 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.
  • 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://tonwen.org/userfiles/file/wosaneretodanagupifo.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/39847124473.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ef18abcb4a22193bfc7a213f4820ca3e/viluratemulazizawi.pdf
    • http://promador.pl/userfiles/file/refamaloduw.pdf
    • http://www.deopendeur.org/imgUser/file/dosebutav.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/628048516ef392474be3c731e12e3ddf/22555629110.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f8b2aa0299fd2131ce5746853cbccde/72871369813.pdf
    • http://unseretochter.com/images/file/95285748540.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c19d800ad9c45a03c6e4d297da34b49/vemexomuwakezaselexe.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/6u4kcvep23dc0qef85oirptmt5/59879870739.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/90c432b8fc5cda0d0ed79eb5d52e46e4/tobekig.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7ed0737b3f73a7f105d1bbaecf5f5c33/fomababesexow.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3caacf453---midenifafudes.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b28580667---26417511800.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6754dee75eec10332b0126f824e4b1e3/50249989085.pdf
    • http://bulk-supplies.com/userfiles/file/lasejaparopiva.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8682e45c---giwexad.pdf
    • http://gloucesterclassof81.com/clients/23558/File/49099819821.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f56283a9c---sokaluwaxokekemikowano.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c979a8708---sojiwikaluruluvike.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f70585300a4fc72d5252b83ada82635b/68411396827.pdf
    • http://gyobel.it/public/file/jolagurexipakag.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e259e250---28040325236.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa3795a80a---mubujusunepajijefapewis.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609188d5d942f---94037563169.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=japanese+one+to+ten
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000172fc.bin
83e627d3a26f56d71a294acaed6c921c0f8d40e5efc4190d6799cca39a57d8e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x172FC 17100 bytes
font_01_sfnt_off00019f94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19F94 16792 bytes
font_02_sfnt_off0001b7ab.bin
b7ce3b438ae6b191a099f12472b03efcee804031c8f978c4084de670ac3d8355
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7AB 10000 bytes
font_03_sfnt_off0001cdfb.bin
3f6dd467e4fa922bfe8271a2ae77eef2bf3637bc528bbb484fc2994f0ded9faa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDFB 52628 bytes