Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eff4cd3e2bbfdb0…

MALICIOUS

PDF

86.7 KB Created: 2021-08-18 15:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63d4ba04069dfac8539245874cfdf171 SHA-1: bcdc4ebc4bfca02563cea0b578c0e3fdc9c1c331 SHA-256: 3eff4cd3e2bbfdb0649020dd4f6bba77012ac3f423e57cd0ba1dad704e8568d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs pointing to compromised WordPress uploads and disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics strongly suggest the PDF's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/uplcv?utm_term=jj+benitez+caballo+de+troya+5+pdf+gratis PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0926cfc445dacdef407dec3d94701713/bebekinarotakagiwusi.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/12135523661.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/114168945060bc116483f17.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/gezolutibimowotufosiligu.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a89faea13---25545569221.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fvq0vg7421r6c2l4cgd3dd4it4/16794193321.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/s05t4pv0ash330u57eujsp1pio/84111164302.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/j92l9pbsbu6tmp7jfjke80u3a7/sumejesazigude.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/94516588156.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/48438413748.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d53a179c---47223674551.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pawasenebizojesolikuke.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/on5p10ubq931k61l61619cf0bq/moduligatexo.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/vegamewune.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/tixabojutetedapekakare.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/48c36e07c489f8cd067d19bdb243b5a6/23613440446.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52358535177.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/putidamolufuvugofazoxut.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/77614925913.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/63224070478.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccd93d9218da9a6c0069b802cfb28333/gomimoti.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/3315544355.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 18228 bytes
SHA-256: df927f3d84f4ad6b8de54b74c91eb1f3f92291d03738c680880740283722239b
font_01_sfnt_off000117f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 11364 bytes
SHA-256: 5cda82015a3f0f74898d55304870a6637eb51c8dcf86827a49cc6e01e3eb4034

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