Malicious PDF — malware analysis report

Static analysis result for SHA-256 78273e2db4bfda90…

MALICIOUS

PDF

91.1 KB Created: 2021-08-01 08:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a03f4897bf7586dd796209974231f70 SHA-1: 3e3eb9a6650cc254a489f58c88b49a100bc328aa SHA-256: 78273e2db4bfda907eb364944b83913d896c88f12851063214231d5f1ee372f8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host links or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ptiajnm8brbdiu7pu36uqqpcdt/modawamefi.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa32a36fb---25883908764.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09c9d5e32---89383283915.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/10m7ldsvbavv05hcumgsqaksh2/53892235524.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/labexalokuru.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/0g2il29r254si4ajrb70j433l2/79335212895.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4aed503f2ef55e6f9281eab213c724d4/67775802140.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/46506778077.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/3732064917.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oqf4adsfegje0bquq5cjselfs0/saruxosixojazojafusilivuj.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/51650748671.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/wowelovepemadedukekufake.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/5967976143.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082238a411d6---fuxuriluvajiletisamoreda.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/70223061018.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/belitudexoledozogutepexom.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/jkn9l5o45deuruo8ksgh71r02q/jirunokumawilixijedux.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b88a7eccb---dimufinifogodamasijet.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4528540cb0---fowojawagidurede.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/sapewilikenakabuxopifej.pdfIn PDF document text
    • http://vodnik48.ru/content/file/81431706664.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/75745067960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=farming+simulator+19+money+cheat+ps4+offlinePDF 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_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 11416 bytes
SHA-256: 26dfe095fcd82148b829302bd6fec8f13d9fcb4d6e1125741635b6ce5a49468a
font_02_sfnt_off00012bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 19452 bytes
SHA-256: 185b3de3ccd7aaa8ed3ca480da4c679bc896cf52780c61dea504f8aaf4850b68

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