Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d04f94f81c74bf…

MALICIOUS

PDF

73.4 KB Created: 2021-06-08 07:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b6e26cf26a85271b511c3802774e00a SHA-1: 64cac64b4f7491370f99d2d8cdb80743248b45df SHA-256: c6d04f94f81c74bfa65d0b26eb8b7b71e5e55b280d29aaef0bb147c220312d39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to compromised websites and potentially disposable hosting. The document body, though heavily obfuscated, contains a query about purchasing a Cavapoo puppy, suggesting a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=where+can+i+buy+a+cavapoo+puppy
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/bu26nj00m8a9agrt5go39d94ai/denavudeman.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/45fe0c3a30de183184bf346cc477b9f6/96938335848.pdf
    • http://massageindex.nl/images/uploads/47712350733.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a5fc492de9812ade01e2062a1b8cc4c1/38400996204.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777b23f1312---23248074516.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8793d28a3---6163161875.pdf
    • http://aftckwt.com/uploads/file/luxibaxizimogu.pdf
    • https://rajakeempat.com/contents//files/14778465486.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b7dffacf690d90a7983dbda15001fe36/dusonoj.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a679ba6fe1a---9890469814.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc68768e8d5820bf6e995dc97b8ef457/wewatu.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8af25334ba---23929819849.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099318eccf9c---76392606363.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5d1a89375---mozisabududisetoxurego.pdf
    • http://alumcity.ru/userfiles/file/vawikifelaf.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c1e340272---mitutuvumubitakewibube.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e251.bin
f8a0e0b1af068c319857b6277e37a9768649fc45951f8f0865ddb17531fff25a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 5128 bytes
font_01_sfnt_off0000f3d3.bin
822c911eeac51d02b6eecb27045d2746e4250e23b27676ef46f62a78c8a5f78a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 10800 bytes

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