Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabf631604f20a13…

MALICIOUS

PDF

119.1 KB Created: 2021-06-30 03:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1f71975af0819cf764c5230ec4a136b SHA-1: ea85291c27310f5b704d97076ab203b744dc8d92 SHA-256: cabf631604f20a13ed282d41e6344666eb136fe85eee9390cf9c0b318258646f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery. No scripts were extracted, but the structure and embedded URLs strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/56751fcfd3f24f6fb9fdcb6edcdd3ffb/96107343828.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c7373aacce0c102119ff3418ba42bd34/dobitumifulusiputu.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c385f29146---41584453694.pdf
    • http://shinies.ru/img/lib/file/salujirofajugugivana.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f72cca03d---49986019844.pdf
    • http://goref.ru/files/file/61763940503.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078cabfa048c---33910285217.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/30037264588.pdf
    • http://agrobud.net/uploaded/file/16918944686.pdf
    • http://119pump.net/d/files/12331993609.pdf
    • http://short-story.ru/upload/file/palovaketafopodavojof.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/89608271003.pdf
    • https://soudurelausiere.ca/upload/editor/file/22319035048.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e8925f7a1---11347036593.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9290b7c21b8940ded04c677a351577ca/45148152000.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608655998c840---51004770481.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3af64abf---rogebinokuda.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712a14813e8---pamojenobi.pdf
    • https://burgas-remonti.com/userfiles/file/99735719240.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85853b4c7---85880074072.pdf
    • https://stmpallet.com/ckfinder/userfiles/files/temebovodaxofutulasazobu.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160733bb71bc01---55921967662.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770d701e2c2---zitonulenokif.pdf
    • http://grupopiscis.com/upload/files/81793064822.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=exponent+of+16
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014736.bin
b8f4a001492d38051736e9c5b001e02109053cf33883ded503caed5db8fe4fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14736 20448 bytes
font_01_sfnt_off00017dd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17DD0 16792 bytes
font_02_sfnt_off000195e7.bin
6f9abd9241099030a781c59d4234c142f79b093c153e47b251b6d00fdf7bd1d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x195E7 10088 bytes
font_03_sfnt_off0001ac8c.bin
38e572c6df274c65fab55aaa68e76329d25027d4caf9374e30b233fe7a26c728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC8C 2100 bytes
font_04_sfnt_off0001b607.bin
41ddd43e3bdb2f8fb5635bbc4a84217d82b337083b93976bce2ccd5767bab356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B607 16500 bytes

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