Malicious PDF — malware analysis report

Static analysis result for SHA-256 091a25c53e9c1b66…

MALICIOUS

PDF

92.3 KB Created: 2021-08-10 09:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cdc8198e8a0d95e27f8c57eded669792 SHA-1: 12bb916a1bf218356e64d9f7ecb66527000ea7c5 SHA-256: 091a25c53e9c1b66dc15340299e66410e39f3844861dd932ec2f5433452d9aca
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=cuales+son+las+escalas+de+temperatura+y+sus+formulas+de+conversion PDF link annotation
    • http://kolesnikov.pro/ckfinder/userfiles/files/maxenupapujexagelira.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/d73f7fabb20cf900b38d9aff1fc86f73/sudamiranal.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/76354590079.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc472190c9b---11347194241.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/susedidesajibunawo.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a9cedb48a---50014062731.pdfIn PDF document text
    • http://minerva-collection.net/files/files/10257692168.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6934b200dd9ab42110dfc134dc6f5cee/30643918206.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/c39ms85nuq4m4th043lnq1q0j2/28474957585.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081378644e1d---wiferemagatibulubatop.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/39337459278.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/183ce8a1556f066ba8bfac6fdf187df7/3275258790.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610429fb8ae91---25470344047.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/xejesamobujufowibiwezuja.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/84286332536.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/vofuxepoloraretutu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7cfd5a68---viregikafotejuwed.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/8c7f7b90dd4c4c3bf83a0e4cceb7bde4/61420311258.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/rikop.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad54379f2---jifodusuxan.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bb904f32242ce64442e871f85d99454/kilubiwus.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0028c4ba0---36183670351.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_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 18376 bytes
SHA-256: a98a000d60b9c1532d6aca79389c65cb5d4636e9a4abfe03b2ad944115c5fad6
font_01_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 11092 bytes
SHA-256: 7532a42194630b50065d57544af5c4d57760257077be73508412904e247cfb06
font_02_sfnt_off00014781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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