Malicious PDF — malware analysis report

Static analysis result for SHA-256 4087b58218251117…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 21:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c016862a8c63320b3f2aa74408431f09 SHA-1: 4d151364a0c9247d33f3fd32ac88c326a33c18cf SHA-256: 4087b582182511174c8aa3def6f6a5bdf7e96a6c3e4a8209afb41929a2f47863
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 ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://archism.ru/uplcv?utm_term=why+did+the+chicken+cross+the+road+best+answer PDF link annotation
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3214d668d---mufexerelunerodudud.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/visozifeme.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/suzadir.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/64670283553.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/73517753697.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/11141602677.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/72991356054.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/uc8voq5funsf67kpdql47laeo6/maridevedibu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0ed0f73c---67838366262.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8311abf13---medasinudat.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/28427510315.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/54473870535.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/aef721b0b7eedd81d6a662c47d478c37.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202108190038024189.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/92110118216.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/599e19b726013d52800aad73a2348a65/53206171014.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/fegex.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/62916129692.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/82539d62b36000c4a5c081ec63430c94/kimesafikebe.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210717005829.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/64847215253.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/4cdc0c976d806019b565d48877773c16/1562426693.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/lagawezekozorowu.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608147f237e7f---22848283789.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/funiwubipudumi.pdfIn PDF document text
    • https://vestol.bg/files/file/37553726884.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_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 10848 bytes
SHA-256: 2166c90cb92f3031633989de46dd28e6faa047e4b7cdcc9948838a36ed6872db
font_01_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 16764 bytes
SHA-256: b3d04544dfe55d37699689d6e6ad5f2174eb56dd547224c6f4113f09ee83a845

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