Malicious PDF — malware analysis report

Static analysis result for SHA-256 251afd84e12852e7…

MALICIOUS

PDF

85.5 KB Created: 2021-07-05 04:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 77400f5bd8ae8eb599c065c1d4e46f5f SHA-1: b234055bd295cbd667d88bc4c164d860f1af7fb0 SHA-256: 251afd84e12852e7453d04753ad0ac3e7fba63031497f1374df71fad04095421
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=we+beat+the+street+questions+and+answers PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04f6665967---zegakixezopimoxiber.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/31051309117.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/7650007394.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b3cc6fb2b26ee5807c4759021f741f9b/31931311351.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/surivusefogumokibirosoxij.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76fi325vtq95dplr6q8hhhp1a2/gigorusetubajiroridipajud.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/68d3a8cec0572574f2d5b0c1dc13b1a9/79002364279.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/pajutaridusoxer.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/zinupofidenunabosapowe.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qbinummv865l3tcroe3fsrmgr7/luwudun.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/piwipepamesasojilofokofun.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8caae6d2a5---xuvatirejoxit.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/41246553020.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/86958069098.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/vuvifufasiko.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c5f30509e86c9a86c3c513eb718a02c2/xekapome.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/hr1i34v3p2odnmp9c85ainhr94/larifapajijunuwaxuvewexuj.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f92f6368cf4cd207c5ffb8ce8aa2ef78/mupijeka.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607061ca36267---61519415960.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/malowuradix.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/bolebijamukivozafuwudobe.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160defb946a8fe---zetetulanudipuketul.pdfIn PDF document text
    • http://chongros.com/userData/board/file/mizoxebifexifaxogenivosuk.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/maxunogel.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_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 17048 bytes
SHA-256: 03ae18aa6f651670bc23c3ad7457d2902acebfa58ab7c3e380f1c29eb87976d3
font_02_sfnt_off00013015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13015 10764 bytes
SHA-256: 00f0f2f0e87134d18d3dd25429e45e8946b085ddd87f2fc99cbc601eb74edd8d

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