Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5d7a2981e340bf…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 06:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 041956b6f7e879f40e40bf15aa1a9e9f SHA-1: 958629a8185ad5e2d9cd2392a243851a8600c053 SHA-256: bf5d7a2981e340bf4e66e2cc1a46a69cc0d7928c7c87bd7f8545fc67aaaa6ac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=hyperglycemia+symptoms+in+child PDF link annotation
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/gurosalukonakimij.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6r9k7rb1lgdcp4qe5ed5e6pcr2/68603222342.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c55ecb692---zuwixefe.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/r3c6rqtftt550pkkr774bq933g/2001429052.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c37c7a714---jebujowidopiki.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/91905383288.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/38896048525.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7fcbbec52---folajajoxurivaxabeb.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f87a42cd2a96382d60b9394ab27f9dc5/2063488004.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/zelafeliwosutazo.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/35639012657.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaac7a1ca2---xeduk.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e92cf3502---bogumemuw.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/12240740391.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/80024106915.pdfIn PDF document text
    • https://kawanmto.net/contents//files/93556836481.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796400ea27b---gesipirezuk.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/86621223030.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/2854840110.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b65f99f90c---weramadotivomowarinoxa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/stt4os0l9cpbbmd39bd1qjltpi/xebelebojurovujes.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/kibazerunagipajekerixagav.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/79165317697.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/96390541096.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608372f7733cd---74719217786.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_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 11064 bytes
SHA-256: 508c8e9b56a42645d7800f0214312b0b4998c741d80ad98b20e0fc47a4e9a8b6
font_01_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 16816 bytes
SHA-256: 56e138c92b903df3a40b94d8cd48d0ea638a2d6f023d08ad85a7564db68ca996
font_02_sfnt_off00013852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1