Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1eb7a4df601e0a…

MALICIOUS

PDF

87.4 KB Created: 2021-08-24 22:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 871b7785febde84cc6cb5c6b22c454a6 SHA-1: e8f5680c01882966065147764659d2804023fbfa SHA-256: ca1eb7a4df601e0a7e312aa8d503342cbe65425f3d26d2946d4c6685b3a63187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness, specifically identifying it as a phishing or trojan PDF. Although no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, hence T1059.007 is included. The primary attack pattern is likely to be phishing or malware distribution via these links, fitting the Spearphishing Attachment initial access technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 http://kulturazebrak.cz/userfiles/janomibumipad.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e303c84a2f6cdabad6c2d634cc8d7c00/68495291738.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/38125232142.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/xisuvolelotumogobugejuso.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0frrcoqrd2vd3jg2ho01fgq70u/lutetijonivo.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/53553320917.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/retuvexudoratabowim.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607762369be66---76443384568.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bdf509e060edf4807a426a1966183b35/nemiteremud.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/tq3ai9jbslkev5dg9hkufnnse0/33848707310.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ea270e83a---53002033301.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/bovuk.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/31408367885.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/34664340900.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/11183553846.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/19331925175.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/towojupetolo.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/80614819031.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/25bq6fd0bs4ec1k2cerr6ssobj/14364983731.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160756011a05fe---barijanetakujanuvon.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/h3oaov51hmqrh9gaa6mls2hgna/65268435919.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/83664855341.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506045758437820.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0fe8c1a3a67e3cdf774c4a6b72b4c5e1/81122551249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=simplification+questions+for+class+7+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 11152 bytes
SHA-256: 80a34583381ddd9be54c22f02c27703204895191cebd80c5741d8cbbe3f8b143
font_01_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 17048 bytes
SHA-256: f10385a804b178fc16d6d89c8e0fe44e1962ca3dc2741f9b7e45e2d7d0f25093
font_02_sfnt_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 1780 bytes
SHA-256: ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c
font_03_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13851 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59

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