Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44384c46ab66651…

MALICIOUS

PDF

74.9 KB Created: 2021-06-11 11:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e8a0a29cb954f770d4e5ef8bc9be2f68 SHA-1: 515117ebcdd66b5cc42e81e700c3b903d0409df2 SHA-256: b44384c46ab66651c89d0b0d9a4510ed215ab6fb746424fdac3b7a8aa85b16d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing or malware distribution vector. No scripts were extracted, but the presence of external links is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=apa+7th+style+guide PDF link annotation
    • http://alnoorcity.com/userfiles/file/87416684643.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/3911864644.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g2s5vklg86eu7jqk5o9q95obh3/sebikadalulunezib.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/m79usuhkf1kj92aa7s6loapc71/kusaxuvotujodevedimerome.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab01b5d84f4---sefokumamijedudopil.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/88382458791.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/84698781653.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/82202350850.pdfIn PDF document text
    • https://chp-travel.ir/data/file/toleberuxenogawile.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/dunirexawetasutexuberezuf.pdfIn PDF document text
    • http://dges.in/userfiles/file/85958295507.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078b89216dac---47749663942.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/hd459d34qdmbkifpeugvrorv8r/rugibipuwanidokoborujedi.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/nisumejojivasikageru.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/retosejuzipulo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e8c6a533f---38974100530.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 5296 bytes
SHA-256: 7bc19d8853923aaf164787cb08e34951baae1ddcd81847451175c195a4b98b4d
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 10824 bytes
SHA-256: ec965aaf4789cd89075e6b81ad1aa4b2101a292b9d72d0d21bf79f30862e6ca3

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