Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e58289db92283ad…

MALICIOUS

PDF

92.7 KB Created: 2021-08-29 03:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d18b82899354ff0cbd3821bd3ca4f3d SHA-1: 176434a2a3b8aef0dcb2ddf842de35681cbe6c71 SHA-256: 4e58289db92283ad3d549fd6687d2eed522f1f2fd64e6782ac7d53f52935247f
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://gapoom.com/upload/fckeditor/file/wivowibaludisexe.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8d8555ae---tebigado.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078834b6f278---73774218937.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/o600itme1b1hvfpctgvp2im32l/pazug.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117babfd8cd1---49034331512.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/sibopatuse.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/rqddcdb5j6edovfthf23p3on65/lagovebeko.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/mj80n02i9gk6id01qd25257vis/xawutemukukevamexuwomi.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4bac7fad---48387928684.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082236f831d4---fexetabefumitinexoxij.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5b231aa6ce4165163c5c47c88c996b20/tovotafofutevujejodi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f1b1f7a98394b126ecc31c928f602639/guvekukedawasa.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/vusofevofaxexom.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/fijupixafedojobove.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a924ef19b30---84570380266.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/bawek.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/35389254909.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080493bd138c---86456208419.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160f36a9c26a8b---vosavaxidalodukewodeg.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cfecb298f---dipawovumivevinanorutor.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6540a68031---24759192468.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/319420142d86e65f6f2ab533c164dbaf/66198746211.pdfIn PDF document text
    • http://artospace.com/pics/file/bamonasizorobefod.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/30956920271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+road+with+no+returnPDF 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_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 10280 bytes
SHA-256: 2ceaea69b8be25f579f69793b1676156fe8c71156732dd0cd8a24f43465ed7d7
font_01_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 17256 bytes
SHA-256: cd598b3476aeb67c83677cb0e5a1bcf893879e74d43503319030c90109fc6976
font_02_sfnt_off00014c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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