Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53b2b77abe65269…

MALICIOUS

PDF

73.2 KB Created: 2021-07-07 19:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 629e7b441ebb04488372caea472de53e SHA-1: 996b25054b3a3e85345611677a6c29af4f036347 SHA-256: c53b2b77abe65269e9dad68579547b0e19691fbfe27ea4720e07405b223c7b34
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document's structure and numerous external links suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://akonis.ch/userfiles/files/baxugipowedaxa.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082604f380cd---72823062899.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/bixilovemebevuruguvogivo.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/lowarokenixepiweb.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0575320fc---gifuti.pdfIn PDF document text
    • http://dalaichau.com/files/13110816911.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160728e3589644---dibolilo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8dspjmhqn0c7m50ar9hitsi503/gajopav.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b074c45e0ce---20621324267.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/t8pbv1b52c151e53pioq2sbeb5/dixorigab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa1706bd32---57670372892.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/3ca77f29f03b83e745f6605dcca25a2f/pizaw.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/02c43dd23fd26c33c6918a61d6f64000/67066976287.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa95e7ded4---votefosomevaf.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/3399038755.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e500bd1f9---46711191165.pdfIn PDF document text
    • https://goodline.by/userfiles/file/51747966400.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/23619840474.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ac05dd7a---wakij.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/56491852647.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/nulatinidi.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/mumebivoz.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/28808661964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=probability+distributions+for+continuous+random+variablesPDF 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_off0000ba6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6D 16388 bytes
SHA-256: 49db802fd00ce02213c361d445f24c657714b3bb9991308584cc6bdc57cdd326
font_01_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 11060 bytes
SHA-256: 67281429cf29309db463e7b3ebb9e69c1994c6b9eb63e49b04f506dcf94b826f
font_02_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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