Malicious PDF — malware analysis report

Static analysis result for SHA-256 0508697f7ba94a70…

MALICIOUS

PDF

69.5 KB Created: 2021-09-03 09:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87843e9dc83a0fffb867530acb5b6368 SHA-1: 1c5df454afa41fd1da6ef8b9c838967a73679575 SHA-256: 0508697f7ba94a70f2d31b0d19ea20a000898e8c66bd2a1fa8e6cfd0e356b7ff
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate the presence of link farms pointing to potentially compromised hosting, suggesting the document is designed to redirect users to malicious sites for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://bidmitt.com/img/files/file/84006835101.pdf In PDF document text
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/34150336327.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/fibopizunaminibituw.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/zisoger.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a3a881e49---mutufomisutetedajijivibu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e187a46f988---1813814685.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ac5b10fb89aca7c4a7df9baf03c65c8d/fuxediberaborofeta.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/95096358536.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/nariravibadajox.pdfIn PDF document text
    • http://benrassam.com/uploads/files/50126182632.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/35269190191.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/56144271795.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/97208602488.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/gadufaru.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/senubij.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/vemasof.pdfIn PDF document text
    • http://bamor.org/userfiles/file/runofijejeg.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/50446276256.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c6f3c3564399e036bc187fca8fcafb1d/narabiw.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/48241516424.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a2563a415---93514883934.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/79342173164.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/17062908404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fifa+world+cup+2018+schedule+pst+pdfPDF 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_off0000b22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 14152 bytes
SHA-256: 24e1e76ad1f9d4af7e6b06c9ff36afcbae221c548096c68dd6e4b0a2e8cb7d98
font_02_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 11280 bytes
SHA-256: 294d9443783ea66f16d4543d08bde0b0a5bad4d5b9c699ae39c144d2d9ccf83d

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