Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73fed362d4c9c6d…

MALICIOUS

PDF

76.3 KB Created: 2021-06-19 04:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 17fcdd3e0318ea243be37840a18a0b7d SHA-1: c98c5aa09ed3a868dc95b74d355100c20e964866 SHA-256: f73fed362d4c9c6d5714aaa783410bcce961255db16252a3c2adeb3fb84da3ce
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://smidgel.ru/uplcv?utm_term=present+simple+negative+and+questions+exercises PDF link annotation
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c966ab5ca5---58841198531.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/kumomidizuwawemuwanol.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b666f06374---23567967161.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/1ecf69988718c5d24ae9ad94fa5d8b5c/78601520093.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/41759578122.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/kowadirasizukuvizow.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe0004990---57114810430.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0n1kngp053nffja6ce28s2vj6/gofilarutovujovuzafe.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608467b4d9bc9---relubokokolugatuzegib.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/kiwijef.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/9pb34vai2o34b1vmuasr38fod4/3934002211.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6990308af---jebuvawelezazes.pdfIn PDF document text
    • http://brukbet.com/user_images/file/tepadijipib.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/71081270b6ddda8c0832c6c2e2c6bcaf/fosifoxesetemugifex.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zoxodexiviwejizereb.pdfIn PDF document text
    • http://beta-rc.com/upload/files/zafetowibax.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_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 5648 bytes
SHA-256: 35729e1ef381acc9402b0372c8cf9e90a49ec7a27e7d57b05f4ffe29afcb2165
font_01_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 11172 bytes
SHA-256: d6267d537571c99ee16ad2ec709aca81af203f78522c33042dca5dba9d78d966