Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa5ff0ede55561a…

MALICIOUS

PDF

137.8 KB Created: 2021-08-04 20:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb359fd6b34756ca41bbebdb90054eda SHA-1: 1d41917b69e0a3717e5ba28a6b0fce3ebd2f8713 SHA-256: 5fa5ff0ede55561aea9f2a0a906e19cdfa09bd91a8a9960d2f6329d137786313
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution document. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of external URIs and link farm indicators strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://weifong.tw/fckimages/file/kejujavawemovu.pdf In PDF document text
    • http://hmconcretemixingplant.ru/d/files/90680168323.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607765250196d---givenosote.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/guxugera.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da330b250---70699613176.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081db7cce503---91913337057.pdfIn PDF document text
    • http://ellev.fr/upload/files/lazawimik.pdfIn PDF document text
    • http://forti.in/userfiles/file/58239029826.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9kpbaihg4qa7ug7rmlq9ed639j/43550418425.pdfIn PDF document text
    • https://loctra.net/userfiles/file/5405952135.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096d7aad3e51---xodopanivelu.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/zufefojulotiduvo.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/weridefowiwovagibuwabila.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a241c4de39b---33889934088.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0426471001626918874.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/fovebujiduweni.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e575cd4ba6f---21136970679.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/94253776752.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/10181203753.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8aa488a1---46837347941.pdfIn PDF document text
    • http://atrsara.ir/resource/files/1305136201.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/fifupademo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c116bd33c9---zagifekigib.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/58684853370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+long+does+it+take+to+become+a+millwright+in+ontarioPDF 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_off0001b581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD93 18296 bytes
SHA-256: 1b8ffcf8e99838c5128ac1d5348db2a5d56d7b1404843961c4a5adff7c3c53e4
font_02_sfnt_off0001fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE7D 11128 bytes
SHA-256: 52afb3f7051a951312374a3c45cc3607d81db50df2bd88cff25800a326068c50

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