Malicious PDF — malware analysis report

Static analysis result for SHA-256 74235bdb10089f99…

MALICIOUS

PDF

76.0 KB Created: 2021-06-09 09:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7aef989a993378804a01232716ca9137 SHA-1: c21173bc01f68a9fd9d21714ea03ef73573c2302 SHA-256: 74235bdb10089f9964d2450a19451327d92a4499043116be187199776d633a5b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9220

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://drafthe.ru/uplcv?utm_term=non+experimental+research+design+pdf PDF link annotation
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/93982f93a449293b58bc7c88a6df8870/sojenejajusejiwu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2140312db582e59f9ea3cd5761634b35/74832581098.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d17343162d030564282156c165ad432a/lawuvibowotimomidofapelir.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rokrhi1p3q0s9l8vknj3ntof6b/54289923967.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/19752589645.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/nolabutokusuvo.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/tilokuve.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/43309812760.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/bb68d5a883b36f3cbef30470d3b28079/sasuxefidumetiji.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/76301722285.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/135e75840f7a3bf975c94d37a2936aee/gigogubitavefuwe.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/6724052893.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/812761f4ce475b79441b0c5a5897d1a8/27703984564.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09d7253b1---xagaxamitowope.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6565d27c---2037917622.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/5e906f955dc8399c60d1f36a358c6d9f/89126123324.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 5396 bytes
SHA-256: ce5269e55d3f62f3df1942e58f2294fbee32e0c9cf1099afc3e6b9a144b3cd39
font_01_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 11708 bytes
SHA-256: 0d66a6084a9153dfe021523eb216b9259c7b19603f48b33a2f38cfdf5bd0273d
font_02_sfnt_off000122a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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