Malicious PDF — malware analysis report

Static analysis result for SHA-256 308d64b3695776fb…

MALICIOUS

PDF

72.5 KB Created: 2021-09-02 05:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c4d0b7f466f31e64d15e8e454de4a13 SHA-1: e63f1c9847279e47072ee26b510f8166e3d59166 SHA-256: 308d64b3695776fb4d8e6fbed5e1058b3353fe158f3e7f504dad2cd2ae00f1b2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of a link farm on potentially compromised CMS uploads points to an attack pattern designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://drafthe.ru/uplcv?utm_term=all+square+based+pyramid+nets PDF link annotation
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc042686ff---27507911059.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8cc60f6da75ad52cfd6762186cbf0fc/84364600484.pdfIn PDF document text
    • http://belloverde.net/emailer/file/32158644688.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/zevebafuka.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/76cafec1b9739112b3ca2a06223ff38e/wuwonikowinuxezisifokip.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/73367189626.pdfIn PDF document text
    • https://eclearusa.com/images/file/nutirokon.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/2044931051.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/13124808448.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/dizep.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xinipixe.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/88548879266.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/vusivotilosuwifud.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/2321722138.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94e234093---8051566688.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/kumiluluxilazikuwusedudo.pdfIn PDF document text
    • https://33mobility.net/uploads/files/xakikurupajukajebixap.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5b9c7f0dc9ec0afebf6711f22d41fbba/17425517652.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/penobujewawej.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/79157680747.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff23238007---16116726742.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16097b7bba4890---5580630133.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_off0000ba72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 10916 bytes
SHA-256: 60e00ebdcccf20fd42f08235cfa96dbe7106cd86ff71eb652d2469b4e3d8ee75
font_02_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 16168 bytes
SHA-256: 8e977823d454deeb92681badff14f5ab84b6aeb8f6855104c4118d8b8d9a8b8a