Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabfdde3ef100159…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 13:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6412ccefb7cb3cac6787b86a2158950 SHA-1: 0702826d6186e32c94cca7bc7236c0f2203db102 SHA-256: cabfdde3ef100159f6c43e45056ed6cd35eafb3580c8c12e5e3710e10aec8dcb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, which in turn host more PDF files. This structure suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa35b519bb3---29768492520.pdf In PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/58749154575.pdfIn PDF document text
    • http://intertribo.sk/files/30431440214.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160826340b7e53---veredewugobebofekeputavif.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/12440189527.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/genafizarogavoferix.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/11125849001.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/29815692491.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/38874004341.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/lufasus.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cfeb71fef.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/sr9ikjfv1vnjb7msvqb3q9dg3c/dobiwinudusifitud.pdfIn PDF document text
    • http://cga82.com/admin/File/3908635484.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/006e099f0e5c4a59f23ef96621b68a14/mupisiwupupuletuvujosi.pdfIn PDF document text
    • https://tepihtrava.rs//files/tuvuwonokezavetiseda.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/97131319948.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/cffa1bbbdda2e4addba9c11cde18f1c4/gajafopizuxenobamo.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/60899506230.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/56342242508.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/3217258175.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210714_C8E245481A7FC67C.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093188c15d31---gokamanapolipovizowexamil.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081b71fa192f---41134966912.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/meligivopazuloxuxazomemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=microsoft+word+2007+not+saving+as+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF25 11056 bytes
SHA-256: a9e1aeb762d5ed1eb3a6dca793e34df1eef0715f55f94a2c6957639cff79a03b
font_01_sfnt_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 17272 bytes
SHA-256: 8ef767f2c31610a36a4552c8b22a77203535722e5fb25125da27c168106a9c89
font_02_sfnt_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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