Malicious PDF — malware analysis report

Static analysis result for SHA-256 11527bc4219d2357…

MALICIOUS

PDF

96.0 KB Created: 2021-07-02 08:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9f13f9c9d83f26d6751230b7a74b174a SHA-1: a68549abd36501d8645f53610490864ae6f3635a SHA-256: 11527bc4219d23578fdb58baf8ebc1a760b32156bb2bec8af85536f5c4a4a795
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/5v0c3jt8ucvpicrfe3mgk6431d/91816427670.pdf In PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/53732071174.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c75485ae106---kolakusanisadinamisi.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082944ce0eeb---zalifit.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae102e18afa---diziz.pdfIn PDF document text
    • http://edgecs.net/documents/68846637287.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/felijok.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/pekuxebubojozuxizupe.pdfIn PDF document text
    • http://ibb-online.ru/f/file/19429460168.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/342da07841b66564b9bb6b9281b5582c/fipebafifikolozeve.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1dad0baebd24273a30ea3a2998e54cdc/10284235395.pdfIn PDF document text
    • http://falerisztika.hu/tmp/86908449752.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/jegureberepirerutuvora.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d6efea10c43d8e3760d584030e56007a/paxirobilomozos.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dowazuwepojikesekosenag.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/zomonitudaw.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/bf120403ef36cd7f7a03cc03c7875978/tuvuruligag.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb521c45f9a---69744028796.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a189059d1---3981472637.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/21871751511.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/rotake.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/22345039396.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/e76b8672ffeb2ba65490eee8194e9065/37461309080.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/47271557081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+find+the+midrangePDF 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_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 10880 bytes
SHA-256: e481c9595e41530e2adbf70b31bc2459048cec3e5f2620edf66c8ebe5daebe5d
font_01_sfnt_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 19312 bytes
SHA-256: 8abe388df2bebd1cb79ec6ef64ba846976b3b9a69af0bdf7fc988b416ea4c18f
font_02_sfnt_off00015ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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