Malicious PDF — malware analysis report

Static analysis result for SHA-256 f277863461f638a6…

MALICIOUS

PDF

81.6 KB Created: 2021-06-30 08:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef51e397acdf5bb7f793f692f79efac5 SHA-1: 467ccd73b6f28f6afe2d6f24b937b2963b366a3c SHA-256: f277863461f638a63b3600e5372038cd6cc000059ac705b65b9b3ea969c044c7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs pointing to various websites, some of which are hosted on compromised CMS uploads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jordan.si/dokumenti/file/nisisibubatebu.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabccc25e57---69309445008.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5ce47c8e1---61290434443.pdf
    • http://prosquash.by/data/9749716214.pdf
    • https://mk-sito.it/uploads/file/93465312242.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/432a4460cfb7f465eebadcdcc384ca57/81750976300.pdf
    • http://botosani.ro/img/uploads/file/75979726167.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607110bb8358a---jezux.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a8249ad1b26ac19acf073603ee849f4e/xedigedazexevasimavazitu.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acec7bdfef0---82667426438.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0f871e71---lafiradovemetikasofevoto.pdf
    • http://vistobrasil.net/uploads/file/wetorosebanofamet.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d97d035e6b---52335353569.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/666tmso5ifr6t7ou7fv7m29ga2/juvarelarerafedidase.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/67728919017.pdf
    • http://www.deco-interieure.com/userfiles/file/tozezadanijo.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/13627535952.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08cd1ef51---80124395026.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/097a0d80b26069c9ec798d68d04b303a/16931740023.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/efp9vknsm8617qc5d01divol91/xadeluliwas.pdf
    • http://hungthanhauto.com/luutru/files/kanopeful.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/jg2e5ossohrl09m58edb5a47mr/68191273698.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/19097eac101219597e5a154fd8907328/41858555825.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/05ab7030fdfd7a9bb6a680f6bfe0d6ec/rofivizili.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+vc+cheater+download+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc9f.bin
28ba2571048abfa2d41fef76ed72303a8eea0d048a3ee3f43d324abf9c75355d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 17016 bytes
font_01_sfnt_off000108ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 16792 bytes
font_02_sfnt_off00012106.bin
18448ff59fedb51d78c52b8a3b51d89df84871feeb9a8a8a4126498412ac2100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 10632 bytes

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