Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8e7792d0a1c8d6…

MALICIOUS

PDF

94.1 KB Created: 2021-07-06 03:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 940028785f51fff8be8ac0ef414dea57 SHA-1: 72b3ddce52ba17f3d00945e3c3eb4308eb4c2552 SHA-256: 5a8e7792d0a1c8d686ee3c69e9d71c30f22c83a7d074299b446622176d19493e
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to phishing or malware distribution sites. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.patriarca-batiment.com/ressource/site-image/files/6940572060.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6876cffe62e646b0c6932d5329e3489e/zusuxanamawajuloxutaxirel.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c28dfc7ce3c---gavajarakixifosik.pdfIn PDF document text
    • https://ovalpolycoats.com/media/75319022693.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/suvaluwipodefilini.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/va748h3fej1qk3f8su40c4uhon/7098288601.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/5372479185.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/kowatabol.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5153413d55---80719318025.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071da3a94810---fomupixozikatumibep.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacbf1cc2bc---mixezipag.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38034eae35---mokuferilosune.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/pukunamikudadilopewix.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdb24e952---dapilifirabazofujojupo.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/17173826914.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/9364229503.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fde1758ff---81571145052.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf0e2475d8---81140030266.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/o03l2u04u1ctdno1cm03v2ibi3/pojujom.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/79310655621.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf7810baf5---75159463379.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/penotisipa.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/64319405791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=universal+law+of+gravitation+in+englishPDF 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_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 10652 bytes
SHA-256: ae74c2f0c15991beeb5cf6556d03a9132421e4348b70c3e8ca5b6590d23b3f80
font_02_sfnt_off00013c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C80 17900 bytes
SHA-256: a66a4667dc4ec291f5c916beecf61909697d8620372097653ed49166e22b4280