Malicious PDF — malware analysis report

Static analysis result for SHA-256 441d91fc88001aa6…

MALICIOUS

PDF

76.4 KB Created: 2021-07-08 06:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4cc9e8122daa1e2e9fafdf69fc606375 SHA-1: 4950494199d9f1fc2d3dfb7ee8f05124f74d2105 SHA-256: 441d91fc88001aa6e9c409f42c04383e66fb132652f07bc0e4894c4ad0be45c6
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'SE_CALLBACK_LURE' suggests the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. The presence of numerous links to potentially compromised WordPress sites further supports a malicious intent, likely to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/09fb960401a7a566702610165f9722d7/98777279125.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3e90cc357---74989933277.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/30ab49644129a2d5dc28609fa4731c35/rizevapavukasarosuve.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/73487662937.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/25f0c464888f76240486459a6a82766c/gisejupotikajopirefufaz.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cdcebc55e---93374658849.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16208694115915.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/zodasuvolivovuj.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/wusubadimopet.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/85758998266.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/q9h26e7thsgsb8ubj6b1mut2l3/lilupijalavob.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/377263e0aed58fc3d99a3e7cd5a33855/37988950398.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/beren.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/juruxovuke.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/bevena.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7b68823f908d53d7b32a676f19be923d/13445319980.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/zikuvuwuwunigotinu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d7fa50e8817bba3a6a82338d268ba0da/biwizedapefowiniv.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/52847057493.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94ba04aedb---31900072914.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160827f86596ec---vizaduzutepowigota.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/039b04650cece13c6093c0ff7739c6df/52907739951.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7964b5bf5---womalukip.pdfIn PDF document text
    • http://dhf-china.com/d/files/573452125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=king+fish+westchester+avePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 16736 bytes
SHA-256: 12268db8c8ed3cf2d569684431c869f8e4ff7f45d6ccbf549ea5870808af0943
font_02_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 10592 bytes
SHA-256: 480d697ab2bb1a202b1a08ca867bb282fe96a87ccf0cc731013d2d8d133e69a3

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