Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4e1170c21365b3…

MALICIOUS

PDF

86.3 KB Created: 2021-08-25 12:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80c42587f4f920820ca7542ac09014ad SHA-1: d6894bda0333c61777f752f295878033e85f5ef1 SHA-256: 5a4e1170c21365b381c29dfd94e410fcf6c03898f389c2e901c025e6fdc5e324
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://flyingfish-stay.com/userfiles/file/kotodipuwux.pdf In PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb525903c6d---16860803329.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/84097424215.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/mimutezevexupudivopepim.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/5443400791.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608544b9b0d49---52990228366.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d10fdef28---vedivogekikuzigaxi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6uf1dgifdgei61mcroguvhe411/90798646509.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210704_125224.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/65374687748.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/33438178979.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///17913640613.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f04c8dd92a81c73349e15b1dc16ade82/pepaniligopufomafitadoju.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/126c2639e5dfb023264f6c5c3593e297/zeden.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b7867372ce049016680b2c33599f0ea6/rekugerujekevaked.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/10dda553f46762dda498636aa88408c3/pukelifewuruxoxoburoterus.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/fafemumigo.pdfIn PDF document text
    • https://phukienbep.net/media/files/dogumilurasajafotisovub.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/3e025d9c3fefe18211c2c028cb70fa82/daxukulogu.pdfIn PDF document text
    • http://thongthien.vn/upload/files/tibasemerexagosefaf.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/sazaj.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a990b1c4f---70072692643.pdfIn PDF document text
    • https://rentcar888.com/uploads//files/202108091610307094.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bfc18c71b781c2336e7f8f7825e5c720/66816189255.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/silaporoboguwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+radio+mods+fallout+4PDF 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_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 10644 bytes
SHA-256: 3e4f756877549f365a548ed88ef325b2c5956471828faa76a4aaf5f0cd15116a
font_01_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 16840 bytes
SHA-256: 987dd23315aa21fe6d04d8c124a12b691cb962ecc42b499c2edb8e86d766db28

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