Malicious PDF — malware analysis report

Static analysis result for SHA-256 adef4a31a086e90b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 19:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d4e8a10be668f3593a08c75a08d507e SHA-1: a7dc95416b457a4a3115f384cd49e6b7029f5e4c SHA-256: adef4a31a086e90b6213a9895dfb16a202cce92f177415ec44dedd97f2fb996e
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=ncert+science+class+10+solutions+pdf PDF link annotation
    • http://nessium.fr/userfiles/file/37645871317.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18f0e9d5b2---kofabulinofetukoras.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/22785930418.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c8c767b9940147258765c0c20d502466/31214386396.pdfIn PDF document text
    • http://xn--80aawifdlfr.xn--p1ai/ckfinder/userfiles/files/pofazus.pdfIn PDF document text
    • http://hainfelderteich.at/ruwurenatimevege.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb630cb3cc0---jafatuga.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/87896252906.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/jifevimakegifuniza.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/82358913.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/251832484117.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d95a8a54c---lonemujoda.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b0d60f790---76447635812.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e183cd34df7---dapofafuminete.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/zowobefatas.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/vowevulutawajej.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210710181039_tuj821.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/puvil.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c8e07a65---22114927626.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/76696143211.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/38618283763.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e259c8f48e122ae53d5a77f297157791/6261762938.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608710ff47ed7---luruvimopewuzemu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c02e25c627f3f713d471506ea4908929/41569246380.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811dacc5efa---kisefomifalusazasidid.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_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 10864 bytes
SHA-256: 658e107f86f2876efb26d2f7c2e587f3b7ab6c7be261ea8db541a0d82722fbcf
font_02_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 17376 bytes
SHA-256: 59d73ff9d5cf31a4445d84f6356dcef319cb54420fa50fd1027f93e61afbbe01

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