Malicious PDF — malware analysis report

Static analysis result for SHA-256 c748396f7433e8ff…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 12:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb275fd9b7771197821d79da4f9c4078 SHA-1: dceb5cc07915ab6b05712d7b06e302f98d1c58d7 SHA-256: c748396f7433e8ffe0422ce8f9818a596a5ceed4312657fe9851451f5ff25e54
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=flashpoint+paradox+movie+download PDF link annotation
    • https://tailormade-sales-marketing.com/userfiles/file/6742548895.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/74690452907.pdfIn PDF document text
    • https://norservis.com/files/files/dixiputerajuxetanuxud.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16146a4f3ea6c5---80239398950.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/gazakepamubewu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613386b1006c7---46405348007.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/pabosumigilemewojixofikex.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead91f3d4d---watijizini.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xagexumapunazojupokelami.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/jekalakazaroxizuxizefipu.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/15464930207.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/besolezi.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-19/20210919155942107097.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/55d8f3bcca53f91fe30e536b50eb904c/88697878162.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vipupexirolikabinawudazob.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/pikuruw.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/vefevuxizizemitigav.pdfIn PDF document text
    • https://angkalaris.com/contents/files/87582296155.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3ab255b0b---59866000539.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/favezufinivixevurijilabov.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/nebigipavojof.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/82923991103.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/82432228628.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_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 17396 bytes
SHA-256: fb2ec80ff6084a67830c1919eaccb813f1da9a0a818fb90c9042256c09ae47d1
font_01_sfnt_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 10888 bytes
SHA-256: d5c97aaea99efe79a91c49d2fd0f212ddb4ec36a90e4979cbcf121bf80c6ad02

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