Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bc6178d0350f42…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 08:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc1fb918a5b8fcbc57e1c0d0088f7347 SHA-1: bf3672fcaeb881fa61fc7152b016a6662d9b1f3f SHA-256: c9bc6178d0350f4238774f280e2a689cffbb6c7844ef29eaefafb7a44e7bcf7e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6b5ec2f1---56116263670.pdf In PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/2v4v53uf65gamn0fajg866s2r5/48337158882.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0989d56bb---xuzisedomo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/22cc58f0bee6ae6061adccf7d4263052/detufuxada.pdfIn PDF document text
    • http://balone.net/_upload/file///momujuwobabijesixo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6390cb2b88453f26e644db6dec2e7e9b/68605749949.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210812_82D1050DC2CBD8BD.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/xunaduju.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/41167861628.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b714ed8d4---raxilomitanegexek.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e7c1b1036---pagifazijenotoxokefomuja.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1984e14f---lifisefalij.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jidanovopamodol.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff9ba335ce---xibozuropapexoburenisu.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/10721327308.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/26247fdd72c99920b9582ad639e04da2/18662370685.pdfIn PDF document text
    • http://carszana.com/image/upload/File/90834833474.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/43743689670.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/labaxikesixavegofaf.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f91a07583bdeff497940abd7acc5a4be/83395373985.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d3fded26---38000654908.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607531bca9f59---guzene.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bd338575b29---151325788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tsa+precheck+application+form+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_off0000d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 17984 bytes
SHA-256: 2a055ae77447d6490bb982578bf2b520fc959e2bed0ca113dfb48564525376d2
font_01_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 10940 bytes
SHA-256: fcc8456878799034cc1f9c058a6fdc1d6b1a23e01e8a4b975d44d49d8ec2c3b5
font_02_sfnt_off00011987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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