Malicious PDF — malware analysis report

Static analysis result for SHA-256 3393c74d91bccc44…

MALICIOUS

PDF

94.4 KB Created: 2021-07-03 07:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0b878a43c79c1961f250b5728d3fc3c4 SHA-1: 552f5edc55e84980db5ec345aa2fd24812703454 SHA-256: 3393c74d91bccc442132b4ce4c33ea6ab53871a747129489f85232f32a89e28e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://crysiq.ru/uplcv?utm_term=weymouth+old+harbour PDF link annotation
    • http://polyalpan.hu/_user/file/59997527255.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/7a425fb379c9a3f2df4f34b3812b5824/38139881326.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/lujoxomabenobetixarigew.pdfIn PDF document text
    • https://senhewood.com/d/files/15479776842.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/jakekenosabinidul.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8ce2f2faa6a9c361c873aafbbe1dd992/wurotoji.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d6c6b8be0f7faa76113c48c40ebfa647/sadaso.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/12662583454.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608919856c907---20268773301.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/755318b0fefb86296b13eb152fc23dcf/4865724750.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4857749bd8---dimolefevejo.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/43856273717.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/61296173443.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d34d4d6c264---zuwevokezakanojemafilef.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/xidixovakuxuxaragimo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805e2752547---vemanilopijagomudi.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/82342473280.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6a02d9d5---84166700716.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a629ca83ee7---juwenatajoru.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/kugisojarirawadovo.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/27223955871.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/20ca83ec5e92228ed2969ee4e6e0ac5c/29382561113.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/favonivokolejulilof.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/ludimukokovuworisivuweb.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_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 10496 bytes
SHA-256: 13196652e4a0f6ae82f4260893af9ab0e4d3ec66bcf360246cdd07f9f8b19f85
font_01_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 17232 bytes
SHA-256: 4384ff76b485788a709aed9465dbdd86e50aea34e3cfdb903941282433209dcf
font_02_sfnt_off0001532c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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