Malicious PDF — malware analysis report

Static analysis result for SHA-256 481d46ee4e890a08…

MALICIOUS

PDF

88.2 KB Created: 2021-07-05 09:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 03777f2df920454dd28327ac596881ca SHA-1: 274f07ca6b42b770c20efedcc03fa063ba2d689c SHA-256: 481d46ee4e890a081aa62f4e434a2e02e8dfb0d9e699b984b08caa45f5707543
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links on potentially compromised sites strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a14b6c26b2fb2cf2671fc8707f64c816/75204445044.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6542168gbu7qan0if8dd3e4294/wajejavitonewivoxorevu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/hvmul8umvvevj5mnuaj81hihc6/97731570567.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/49992423059.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d03c830b6---liwibiniregagofidezifag.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/sitamofuzaledetivejebi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/wojanuvego.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/872589e21a8817b116f9fca34ebcf4ee/59056860070.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/9b9efae420ab15bd6f20ad05ce9885bc/87530594725.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16092a2c90faa7---73812246846.pdfIn PDF document text
    • http://bio86.fr/fichiers/nawalazifejuloziduxatavud.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/89796810338.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/dufesukidena.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c9872aafa7b3dcf3350b99906d68bb3/nekelata.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f9e9a35f---71287403424.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/43828616886.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/9640770710.pdfIn PDF document text
    • http://techbis.pl/files/file/93422268504.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/45483207396.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/98998219058.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3a9afaddf53e6b763de780698cb4d2c9/26393435234.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/210733825260dfc750bc512.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1c7b51a43f86f440cb410c7f28333042/kewatajegutilulad.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/17793484347.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/diwoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=label+in+englishPDF 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_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 10168 bytes
SHA-256: 4ca82adf5921cbcbc4cacfdfd2004334195bea8333d9a82ad6e3ec5b212e215f
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12405 17792 bytes
SHA-256: d969f10dd39f1280e52ae9d930f30eaf255f26aa1cc9798ae40fd4a3857a2253