Malicious PDF — malware analysis report

Static analysis result for SHA-256 590eb46bf8b6e75f…

MALICIOUS

PDF

64.0 KB Created: 2021-05-15 01:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec41fd165549945d05d29e3d1ec8896 SHA-1: 519ae14bca592d2d61e00b0146a63d0c1fa939dc SHA-256: 590eb46bf8b6e75f464ee89d98aea1bc7975119ecc6ef4efcdfd6dc262db3507
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the link farm and the detection names imply potential for further malicious activity.

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://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084d997475cf---46877799944.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982a6b0d68---66771238564.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d6c9a13c---vaguxubitirumoxib.pdf
    • http://frezerovka.by/images/fxeditor/file/51505692769.pdf
    • https://argumentua.com/i/file/zafavuwipi.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/5298344772d8195f4364de195b9a81b6/82542000310.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/0db9b20a6bbd190335e1629cfd8bad54/67785237800.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160930c25bd788---75849054650.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608261acd0bca---34334821410.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f0deaf32e5a79a2d41e1277833712163/70473035869.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3bbd5dac7b26f4f704979e99830e3827/33141655396.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/e76o83tuqufoddb1hbk5ccgfh1/71541990258.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf2e59f4b0---49149877946.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29099b699---37976393576.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb52eef80---wefezinigajedopaxevozexu.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/267f76825391ee3998d4cded0f8d03ff/84927493309.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/7dd142351da957f2c630f67e5e930b24/ximobibilenofuj.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/388439a33cc48691f18bf7896c67f8f5/28280111211.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bb+q10+sqn100-+3+firmware
    • 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_off0000bf94.bin
7ae045b9117a4411f15289e04d693d6785417e9376cde8fc1fb2212f56605f71
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF94 5680 bytes
font_01_sfnt_off0000d2fc.bin
a18a267928b01672494a5877fce2b66271d7aa34b8810781a37d55d7b74771d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 9488 bytes