Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d22b5ea2eef4b40…

MALICIOUS

PDF

70.1 KB Created: 2021-06-25 02:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 69df476d312719b3d73a87026ada74a6 SHA-1: 05bbe1239ba95ce4895f460d460d326f96a63729 SHA-256: 6d22b5ea2eef4b4065732664428d385a9ef158d07bb010e6933048062856e3ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'save a word doc as a pdf', indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=save+a+word+doc+as+a+pdf PDF link annotation
    • https://pui-vital.ro/msg_media/file/vizililimux.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/26451630832.pdfIn PDF document text
    • https://mvservice.it/file/37687938086.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f2993c0d8979b9866d5654438410a808/zobewuxefajizob.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/41141699521.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/zurosaji.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/72205686382.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/43473835691.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609f572a2b169---75005808513.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/zufegeremaditisumanipalil.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/95r0472fp24ak5c27frtaubo1u/xirute.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/wobumofevafikojo.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/99118372583.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/53185425367bf895b49636bd7ad2e664/37008992436.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb2626870---86701747695.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 5372 bytes
SHA-256: a9fc59a2dba5fc3739dd9e4ebf46152ec4bc48cce84bce01f89e5e0ba09dae57
font_01_sfnt_off0000e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 10824 bytes
SHA-256: b0cabdc90dd0ab00e668073be7f42ece670e5b8fb037073c866df90a20ff0dfe

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