Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e173624bcb2cd3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 11:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93d96cdc133fdb945259aff0a02e51d6 SHA-1: cf8d7dccb6ce896dd07e722d3f2cdebe8be20057 SHA-256: d8e173624bcb2cd316177d12f554a6080401c2db85d3a02c758312919f983269
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=water+purification+and+bottling+business+plan+pdf PDF link annotation
    • https://rentcar888.com/uploads/files/202108240652305155.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/997ed9cbe79c9f8f8e1f7243e1b8f266/mabepiz.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/mbo5t3fv04vm9ipejirevmj1kn/vadimoduzu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/migemejuzonuxumabese.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/kjoamre6thfo2qv2mnt0gf66j2/nezerinetabonofezuw.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/10885903298.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fcb05db21fa8fcb627f0de96b0ca2351/ritibux.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cace8e0505e---18472190154.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/gigutexedutafidomakaned.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/pomifodup.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/9339810803.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/90615946407.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/7978536861.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/xujupud.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16089104bcc47b---wuzerotabizewikuzelonuma.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/84198577522.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/53579439230.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e4db957fa0cd49bdcbc75b312f192c56/pudenazuwujonejep.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/95204558329.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/p94afj7r6otd349bs3i9gknt24/416895233.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/xapopabisovojijazab.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09fe0d5f85---fidowomukota.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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 11028 bytes
SHA-256: 4656e44f149fb259ed553d2416d4a41574b2b35d93bc6224d821e9ace980b34e
font_02_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 17104 bytes
SHA-256: 2ab0176521c56871fa26b6d5e75841a500ccc1e04aedcee26372233311632366

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