Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ae2dad6d9650ca…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 20:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e19683ff6375327bb72cf72906878ef SHA-1: a57f1562b913bebf2c430a6397b03fc798f1c600 SHA-256: 81ae2dad6d9650ca28b070bb2d7b22bf5f9a91852d47e22f441b5b516e3858fd
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's structure, with minimal text and a full-page image, is typical for luring users into clicking links that likely lead to credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=how+long+can+you+keep+raw+chicken+in+freezer PDF link annotation
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/fodetifiwubesowebix.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/butovasirikefukipubovoxik.pdfIn PDF document text
    • http://dsagco.com/Upload/file/fidudozimipuvuruta.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/90494683860.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/3458110659.pdfIn PDF document text
    • http://krzeptowski.pl/file/28718605976.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/diop2geheavjbivsjfgu2fo578/54887427706.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/37123035814.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/63905864982.pdfIn PDF document text
    • https://felicityokolo.com/file/33295709793.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7556de9f9---74819930505.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161386b130450e---62976366309.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0uarhoce5pgc5iam8oj0p2dlqc/74868468105.pdfIn PDF document text
    • http://mosjob.ru/images/file/vusirugebezofobidesedezo.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/maxawavosutorilikonimisor.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/31279289149.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/92018610626.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/54151895086.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vojatuxasotutamutigux.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614209af80382---demaruvopubu.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/12102827573.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/60626637620.pdfIn PDF document text
    • http://hidramaco.com/files/files/66609829546.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/31406702107.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_off0000b16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16A 14388 bytes
SHA-256: 366ce18e50470f6ff8b4ba27e81411380643f8b978095b09271b4eb4b2d7d256
font_01_sfnt_off0000d543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 10936 bytes
SHA-256: 7c2ec84caa4de6ae18ca361735696a9c2a0912cab54e4691986cb6aad969af4f

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