Malicious PDF — malware analysis report

Static analysis result for SHA-256 73681ebc37adcd58…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 03:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffb0c9a7fd76cca801593cc911f7e24e SHA-1: f173ea8fec3a6f3ae48876fae1f446671d32bd58 SHA-256: 73681ebc37adcd58882e52599d901d4d0df430b2619e3877cc8446c9ebb34f25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve to obscure the true destination, which could be a phishing page or a download server for further malicious payloads.

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://master.plus/wp-content/plugins/super-forms/uploads/php/files/9c266c036dbbc4c163462cca992eedf9/domalokumuparolow.pdf
    • https://ewastexperts.com/userfiles/files/76013991625.pdf
    • http://abwessex.com/uploads/files/51739220006.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/1p1pn09u1d5hgpvan9u57esov2/64533568668.pdf
    • https://dbjadow.pl/attachments/file/pafazefoj.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/67112adb9c4bcb41fd6757eeffa08973/kutomuxugudelevu.pdf
    • http://charivne.info/images/file/12986885780.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/918052e6b0a444adece9263c3ffeb265/1912722548.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880877df3e6---vuzigapodilemozalazomi.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/68503429609.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abfc997152c---mujifimal.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a88d38ad---76572500581.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/rusubode.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8108751490---gosotutaxatoduji.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/91vev1nqs71tkq5l6aioqod3i7/9629165252.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bad93155183---pepizevedanivaji.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c9792152a7a3e410bcab61e02a662750/74137874377.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607595e65af66---newif.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082020c794c4---9341872217.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092b2af5f1b6---bogoluzuvatefejen.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/44c6a7beeec11b1e9de5866800dd0784/limojegunimupeve.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c45e03dfd---rarajudolofagepidodogoba.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4a2a7e3c9ced57f45df26f2c95f300a7/50520077030.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=convert+2.5+cm+to+mm
    • 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_off0000eb61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 16792 bytes
font_01_sfnt_off00010373.bin
66013f425f92c1cb32b1242458611c4cce728548c4af4dfb3df8ca87f605d5c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 16876 bytes
font_02_sfnt_off00012f50.bin
b5cd57d723df386714eed5b9d1ddc58ae1287d47771debefd613115bfdd27b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F50 10340 bytes

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