Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4cbac7dc318e9e…

MALICIOUS

PDF

87.3 KB Created: 2021-08-02 15:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3c8e22d4193fc585e5a639ea1657079 SHA-1: 5815fb4bda664af38e9eddce3470954861a8403b SHA-256: 9f4cbac7dc318e9eef31d3d54b308fab507b34eb9358af9221979ea5636df8df
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. This suggests the PDF is likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sns-russia.ru/userfiles/file/14409004417.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba614f6fdae---57411093047.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/petowiwodusoxejezojaput.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/75637974174.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/98488592456.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/bixujonox.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/52c71ff058bd0217a94c766ed23d0d96/9253123174.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c866fc532b0---69020738097.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc17cf391a---goxemiladabesoleve.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/detokugigulivanamidiwojow.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fa54597cbc22c64f464725f5afeff6fe/lutilunuxazegewon.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/oh00054kos0tbl14b54m0sa18b/70810120843.pdfIn PDF document text
    • http://packturf.fr/files/nakaxopu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9564773622bf64ce972350059b4df917/malemojulerafasagifor.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/sadizedolutuwenorazarog.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b56c425915b50b8687566a223568d9df/40019959283.pdfIn PDF document text
    • http://canadanur.com/resimler/files/fogivafuzojepe.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/80917983702.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/93501722267.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2823c3ebf5c209bfcc351869c3261c7c/zofaba.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160baac4e43147---tuzekaperozowesiredir.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f56bd2567---donuzerowulul.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/76701796768.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/42821533970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=honeywell+thermostat+vision+pro+8000+troubleshootingPDF 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_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 17196 bytes
SHA-256: 51cbcfdd1fc9ce48a04e2a99ccef6b8fad7254d2b7dc511694c2e6de4e6abf40
font_01_sfnt_off00011c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 11524 bytes
SHA-256: cc839c2ade7f607f66ca5f4396441d6c24335b8e1e6491908812f034783a8b14
font_02_sfnt_off0001377d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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