Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc55359911a02d4…

MALICIOUS

PDF

93.5 KB Created: 2021-08-17 08:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9fc7ad557d80158e58bfe07b72ee2e6a SHA-1: cc9ca691577a24bf928447e637271048527dd142 SHA-256: 6fc55359911a02d4baf8c986289f56c51591944e710ca00e373e187bc2679267
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lactopad.com/uploads/files/50983509404.pdf In PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/434d0ec106598a2c305ed8b915e1cded/75855750607.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/33vk39a8c4ekf7riududdi04ti/9606133150.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/17357225077.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/52a5d7c5edd0085dbbfa2fe927ddbc6d/diwopuzusezeludupaxupudi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0159f1e72f---35667931016.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/rdncp2nq05bne9s258p8n1mog0/1485977635.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610021677fe14---kexuroxifo.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/jibokijotafalenalubifafo.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e213cb138dbfa0fdb7849ee76f9fd669/49338455438.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/22472380849.pdfIn PDF document text
    • http://jkohut.pl/file/29696671122.pdfIn PDF document text
    • https://ivanamihic.com//files/53237216134.pdfIn PDF document text
    • http://nfc.soo.jp/file/33147848502.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/89fadb677fc25b57c368b1e8c42465ad/59069256926.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/tuxabuwu.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/40584157711.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ff2666b1e7d---nefuwogegigoreloga.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee3267bb52---sutamotazibexiwezipuzus.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bf6c9f435---kugabiza.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c4eedead8ecca87793708be78a432069/wunik.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f8f2afff00283e3f0bf8be34473b0408/lomujuzowerivo.pdfIn PDF document text
    • http://namngonviet.com/user-/files/58820956018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+play+roblox+on+acer+chromebook+11PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 10956 bytes
SHA-256: a2ab794e3a63ff6fa10c3961b03016cbf8b2969a66165a978dd5b3373f4c739a
font_02_sfnt_off000139cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CC 16816 bytes
SHA-256: acdf0204b26fc0014ad75c6e85ac8ca7fa5aa4075cb292c0cd7b8933383738b4

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