Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cffd037eddd91a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 01:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d6b7e7e24b0b2ba79e57954c07cc63a SHA-1: db861caa813f683ca71c85d79fef259652291bb8 SHA-256: c9cffd037eddd91aa10750c97aadafd17502af868036b544e58b467214f2ef49
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=kailanan+ng+panghalip+panao+worksheets+grade+6 PDF link annotation
    • https://bearings.vn/images/ckeditor/files/vodubirukojapusugal.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/jabuvo.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wekasubejekuz.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r942s6i8ik6opb4kidtsskgm2e/45015205559.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/mekofagusogomozijit.pdfIn PDF document text
    • http://gibisch.info/files/files/talijuzonexazepapafoxefa.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c780a5d10---85141272927.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/bd869602e46adf7c6d8bb0fbbd73d57e/7191757115.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/15535048009.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/xininoxoxibinowonupobena.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/95104232396.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/dumutemesogisujoroludeke.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7899705d9874a807149ce792b68cae6e/lesevojeme.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cea2e6f4e---fovesuze.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/gifawokesovaduko.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ve2jsqpt6n7h4fbr93ghpga310/98381729751.pdfIn PDF document text
    • http://kmsenior.org/file/files/37987082730.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/238783117267782599b224b9213ec905/xunoduliterigax.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/lmonatr11sg47f58o3oir5lnic/60757280568.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/ae940f5e0b5ba9a143eb7d76be1a8576/52727845589.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/76512003964.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16125ed18e6096---18355711065.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210625_000807.pdfIn PDF document text
    • http://apsons.eu/files/file/jadawogo.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_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 17832 bytes
SHA-256: 4e62b4bdcb3272425876c0207da551b679cf4d538f7ffe66f54181140a0ffe2f
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 11008 bytes
SHA-256: d81782fe0e59ebc448271ec177fcb52bbf424fbaab5d17aa2168988d2f7c7b19
font_02_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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