Malicious PDF — malware analysis report

Static analysis result for SHA-256 802d4b3ed2c203ec…

MALICIOUS

PDF

76.1 KB Created: 2021-09-21 09:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b6dc1496b84f01854bfe8d4c99f61ce SHA-1: 9663802d8f268b20bdff6db5eb492a763f3a1a8b SHA-256: 802d4b3ed2c203ec63b99ecd25fd8d60f99755c83bb34c07d67a6d6920d996c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of distributing malicious content through these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://interference.ajoda.eu/userfiles/files/87675534038.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421ede50caf---dofogimilitenu.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/paxafumudirew.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/loxexozenobunipigakuka.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/96814740059.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/85723857391.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210909_AA2E9C61317D362D.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f61b5c6439---rowugapo.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/givem.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/boxamuwikunubabimizi.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/71021637866.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/55531206204.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/bunejezotudoxonati.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/96011990554.pdfIn PDF document text
    • https://kultmotor.hu/images/files/timemuwatukiseje.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/22572994746.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/43655109720.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/75203274999.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138138e4ead7---kabinerofagajufotikapiv.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/26713348381.pdfIn PDF document text
    • http://baoveantam.info/upload/files/19687363406.pdfIn PDF document text
    • http://koutingchina.com/upload/files/44324636411.pdfIn PDF document text
    • http://dezis.ru/uploads/files/xadafozupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=4+pics+1+word+modPDF link annotation
    • 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_off0000c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 10252 bytes
SHA-256: bdef188b43a17dcf1c28b14481f0f8e2a63448216ef35c5955066739c05ea99e
font_02_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 17284 bytes
SHA-256: 6ee7b90126339677578fb4ed412efaf7dee2fc533a5be33b43ddec8ab6b02413