Malicious PDF — malware analysis report

Static analysis result for SHA-256 032e1e2cb7e9801e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 23:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f8e788d2ef9bbc2a88be02df366fd86 SHA-1: f727edbbfa48d8309106533764294759a24656ba SHA-256: 032e1e2cb7e9801e924122eeed6d014369bb6813ec2c99aea31c4162a4bcc77e
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://namngonviet.vn/user-/files/40707188829.pdf In PDF document text
    • https://cepatdaftargroup2.com/contents/files/56163659944.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1692319151613c760c6ab2a.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/67008715550.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614121ed7ca9d---kijiralepuvipobaj.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/17568532672.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogilomekixopupajigenoj.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea47a76cf---75409443567.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/losujegavoruvijutepa.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/50134098416.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/puxamut.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/18932763838.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15f0e6aea---venututarusovaride.pdfIn PDF document text
    • http://www.bash.cl/media/file/57717542200.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb9f3e908---82804708008.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/gakedirit.pdfIn PDF document text
    • https://hssanesteban.cl/files/dufafo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75a002d59096db93d891cf1897bfc6e6/tilubumasudukebewugat.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/44386890570.pdfIn PDF document text
    • http://glassick.com/userfiles/file/64572045135.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/55357310373.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/femadabawub.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/pivibuzerif.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/fisufebokopasodupuvisura.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/bumepawerumimu.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/lewivi.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/gekuxobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=battle+instinct+mod+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 20732 bytes
SHA-256: ad57d5fe2a88332f4e6605d9e98c03a442b647d1cd175dff764173f8997b131a
font_01_sfnt_off000100d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 10720 bytes
SHA-256: 767c8a5a8d371e202c7091c5ac2b51db3c69c0d10b69d45bdcb90a6c30b81b97
font_02_sfnt_off00011973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1