Malicious PDF — malware analysis report

Static analysis result for SHA-256 af85a1eabbdde75b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 15:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d1f9edeb78b3a9ed67cad23273d0723 SHA-1: da7256b2583a274d48deb6b31777b30c23497e95 SHA-256: af85a1eabbdde75bf6292d43da0e56d8643d2e0080b8ed3a0738dad412f866cb
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://studiofranzoni.eu/userfiles/files/fegemibokiwanu.pdf In PDF document text
    • https://suacuasathcm.com/uploads/files/tedokixobifavetudamepati.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/r6de31hr1ul5f4nv0pombnsnv6/52768617740.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/mufate.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/ruvukokuduxado.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160774a80de23a---90004922364.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607771240a2f4---samitada.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/wimisuxululugo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d045475135---37716093589.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/wetij.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7368ae9795---fadunejukoso.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97835affb8---6642736784.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/85340230179.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/65397558802.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/f2cfb8a9d9e0f584e21fded383523328/duruwojivak.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/wuzubinozetowe.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/wawagamipademijepodokeliw.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/daa8c26865a2cf00edb3911560f66ed9/nifonuwopatiwesud.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/1829701392.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161216a1f4f979---mikezefebodipipajovin.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/93945871856.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/73559883755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=export+table+data+to+pdf+using+javascriptPDF 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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 11316 bytes
SHA-256: 5bf84a5fc0bf8c77b4afe19fb133f9044681515fc6b08e53f101a567f2d6142e
font_02_sfnt_off00010ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 16584 bytes
SHA-256: 98380d45ec5cfe3372bdfa19135964f6b90267ad56ac58c78769de61e5a8288b

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