Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8ec26d835e1b0f…

MALICIOUS

PDF

76.7 KB Created: 2021-05-03 23:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 34e2ab1435e8c78ac1b013d33813debb SHA-1: def2c3cc62fbf01f01770d5a5da87ccbe363979c SHA-256: 0e8ec26d835e1b0f5bdb446e5ebeb19cf1f036ad85bbda2630dd530c92b12a09
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous embedded URLs pointing to PDF files. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lure users to malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8705

Heuristics 5

  • 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
  • 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 http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778309e77b5---10781900728.pdf In PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/7fbe4fc5ab8630056695c24e1f45e380/17034627539.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/597859c420de2149f1d887915f3daee2/kewagijugevateketulupuson.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0cd2dd9a---vukilepedesefilurunatelo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/61dc4b0ce1ee4898d73dadc83b0c450a/sesekedodipegokuwuwe.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bcbf8d766---lebifawufimobukefaj.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5avjnhcav2a6gmaq94p2f0dcb1/26286651503.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc311e9ab---42726087562.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d5c33281b1b5ce8d1420bd66186b7c0c/galap.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/segix.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/59841613417.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c7a6b9176---56634322883.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe50905bd2---wisofubebefizu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c9c736ab4c4e29cbbd8ba98c011b8463/94657875326.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdec01b24---60299111770.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2ecb52081a95f2383e2542d70774fe6b/87513491977.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/1a12ce35b032514d80ab49be09859369/75771580542.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a322fcaec591a42663ff864162c3e665/18746388193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=master+of+tides+lindsey+stirling+sheet+musicPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 5540 bytes
SHA-256: 2f05a3e7eca8903e59349049b91503812ba388b0b4e8139de182406978a42319
font_01_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 11560 bytes
SHA-256: 598e42fc459a08563fd0ca0e94b339243d7831055469c81488d076e76454ad87

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