Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9696aaf5e7ab78…

MALICIOUS

PDF

89.2 KB Created: 2021-06-25 12:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 629be1c006af84108e3afd41d078f19e SHA-1: f2e3d08486361bf51c95b1b770f766a29a0a18c6 SHA-256: af9696aaf5e7ab784b1400221cc5b2b46e394c71e7c75c86918ff8e0d6912035
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec74dd1c33---koluze.pdf
    • https://bedandbreakfastchia.it/userfiles/file/rarizezino.pdf
    • http://baugeraeteverleih.de/benutzerdateien/dafatodogetawakix.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/pabavazaxifoteg.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/84a2d682e6a8612dfa7fa707b4a6d42b/7820940177.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f10d69e30cfef9ebf8c19706d5bec69f/96109671685.pdf
    • http://honyi.tw/ckfinder/userfiles/file/tokoruteval.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099f624b1741---52874938682.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608196b949e3e---xetibasafesixemisi.pdf
    • https://bdsvieclam.com/upload/files/movifefefebuwo.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/46oma4ep8qmc6cqfc61c2bgso0/kosakozozibadowa.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/afadde8bee940a2ae8c845b9239ef999/72716686385.pdf
    • http://timnhanhonline.vn/upload/files/29835131564.pdf
    • http://bainihu.com/upfiles/editor/files/xowinuxof.pdf
    • http://wildpflanzen-planung.de/file/didigebij.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb3609dd9---63751414766.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/2527265026.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=words+in+letter+o
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 16792 bytes
font_01_sfnt_off00011613.bin
b89d3be39261b56a351c87aff013afba2acf08f49fdd19849190cbeea9d13686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 17028 bytes
font_02_sfnt_off000141d5.bin
07906197f1a24c8ad0ea97dbd72ce5fcecb3e78a54966dfc5cbb817b05784a64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141D5 10072 bytes

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