Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf7f052247f25f5…

MALICIOUS

PDF

137.1 KB Created: 2021-07-03 00:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ee4cf6b3f2031b7057da0488131451c9 SHA-1: d498d1ec29eadb9ebcd0bf3ac72a2da310ebc99e SHA-256: fbf7f052247f25f5e114e88717f44bae6cba868715bcb60fcf43636d4b7c1e4d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely phishing or a trojan downloader. The document body is unreadable binary data, indicating it does not contain user-facing content but rather exploits or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://queure.ru/uplcv?utm_term=capacitor+and+capacitance+class+12+notes PDF link annotation
    • http://nanumed.ro/uploads/files/86446830887.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/83965380215.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb4c15d54---67238869908.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/68997027044.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf02750036---jopezupesuwosawuxaxot.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf784e82e---buwatukojasuno.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609531ad9c5c6---tusovevixotanixubuwaki.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/08a1cppgh9jqln2le3bmcgrk87/rabulekirasuxibim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b575b0a876---86677493982.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071626be180b---bomerevapuwazixe.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c53af010c25---puzizatitizaronazej.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/54450988212.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/pepopu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ee1b54241d313ca5b6e397e243893618/57264801072.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/mufarixilu.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/silinegubodivunaxumu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c649253afe84b828c578895695af6593/2602954159.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c9b1eeb0---15865077200.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/534b6727dd14ce15efa768d11a9c9bb8/13116997263.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/72204746290.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160823564e8145---zinufibofemizo.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/tusenoguroxufedebosegaput.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609152b06bd9b---77541956831.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_off0001b052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B052 10708 bytes
SHA-256: fd58e0891e14a3111b64626d6a4fa5c14ba2085d3ee67b221bb46b465f00bc9e
font_01_sfnt_off0001c91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C91F 19872 bytes
SHA-256: 88c60dc42cac086f9bbf5d3cbe764544bea024fda2a453390c54b727952be2cd
font_02_sfnt_off0001fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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