Malicious PDF — malware analysis report

Static analysis result for SHA-256 f494acc632ff1688…

MALICIOUS

PDF

97.6 KB Created: 2021-06-27 13:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fa5bfc682b3ee60082f5c4bf8abb403 SHA-1: ac71084eeca27014f312b8d94ba58f69c5240e25 SHA-256: f494acc632ff168807310f9fc648c266eb850e99e1ff0b24264a1a11e0ee47dd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

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 https://golf-tout-terrain.com/publish/page/file/mimutodeninalixisakosa.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/ratonovabejidumirupexiguj.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/sijadusagolezalob.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/07cebc6ed03050dd81e756bb9ddd23d0/88848041070.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160aea193419aa---nogatisitazuxipafa.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/796516f530e0faa0179d60262e84545d/53570084593.pdf
    • http://sunwisechem.com/Uploadfiles/files/46250915953.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/surom.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3e261bc371ff7335193d5fd3e8cab87d/58066806477.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b015c1bf21---90883899291.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c924bb2163---rezebim.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098637758129---85966381216.pdf
    • http://webbuilders.com/files/file/rumazixofagafove.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a426913e---40185766604.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/vds91ef263rtmregcl4b1h3rs3/kakarinaseremezotuv.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/41ugb94nurd5tj7a0ed1mrl6fs/korigorizavanu.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/o7eietriv0p2e03rk0kudf58uh/72593320730.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8afc762f3---55800254158.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0462e70d2b741aa2057e65f439d3b402/xununupukopom.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2d8c88cbdfb7461aae3579553b9d5830/86126173201.pdf
    • http://tai-group.com/upload/files/12895491631.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e025b903b---99646166334.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=examples+of+answers+to+job+interview+questions
    • 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_off00011aa2.bin
f0191cdb3f15e9104703c5324c6c6cd21892c552c7e78becdb743d5ab9c59858		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 16964 bytes
font_01_sfnt_off0001467a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1467A 16792 bytes
font_02_sfnt_off00015e91.bin
c7bb6325316b7faeca3359633023cf843b7ec2ac55d02762fd1ef8a97c329829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E91 11272 bytes

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