Malicious PDF — malware analysis report

Static analysis result for SHA-256 335f86559f739904…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 07:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67b75bb97623b88c862979caa4fb37f4 SHA-1: e3ad2e7e116e465c59464947ea88a7a1a2a5644e SHA-256: 335f86559f739904be0a436e26b9f4d0da5acffa031767141ce701ba4ea568c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=online+pdf+to+word+calculator PDF link annotation
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/oi8trgo36bu7vpb35alc2itpo0/kapizisotulidovono.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f02bbbc706---difevegimulevixuzasi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beb6ef87d6a---fuwamuwarisefebinoxuxavu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/b2a1d8d5f67fee4603c784f9e1442b62/10662696018.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e71ab6688---63000599866.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/tigigosojipuporalulepuk.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/843693fd56853eea0eafa88d7f63c08a/5436311490.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/76955106757.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/90670991629.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/7735b3f3fb002da034cac52018b85431/bubasudazijuwijurazij.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2aded5192---93470429873.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/17105365909.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/db2bd5c3d323268f82e407850593878e/robasorebusegif.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/varuwawubobiwok.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/xamumubeferaxuz.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425081690b---61420488431.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e1ae0c2f0---96411263514.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/45440283815.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/f481d395d1f45890a2da3fb5332e337c/xotopiwerozemosedogab.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/54250254589.pdfIn PDF document text
    • https://tessuno.com/upload/files/60dfccee08f22.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/sufuvatigeruzejutuxerixat.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/70295618814.pdfIn PDF document text
    • 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_off0000b5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E7 10656 bytes
SHA-256: 56995a2b5fbbbeb0b2cf169a8670e4b247a00536a7552000818f074e4139d563
font_01_sfnt_off0000ce79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE79 15668 bytes
SHA-256: 0b35a8bd4fd3e222ad39f956d7eff8db763f4f190424b090fe6a51595382b12c
font_02_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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