Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c50c3655ea07082…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 10:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dd51369c9f2fae0769a30c1cb0022119 SHA-1: d808154182630a4200e43e10725d050e6ece6627 SHA-256: 2c50c3655ea0708262435170f161c3f8c87bab2b2992fec189fdc123c48a3f65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, directing users to numerous compromised WordPress sites and other domains, likely to host malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=how+to+train+a+deaf+cat PDF link annotation
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f3d6854c3e531d01fb3360e5ec805016/labolatezavumomidonugal.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/91842968385.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3b0ca5138a7aab3ee1d56e30820a74e1/fifikotek.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/38940446634af08bf56f2cb2f98b40bd/sufuzofusibug.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/50791240898.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/91006202159.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/64183562467.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9029845dc---67839065076.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/ditozexowatobulosajok.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210529015948.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/120a8f5ccc0f03d28a35979aee066f36/zarurufukedoxazado.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/91685600996.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad2348555e---nipupimujawoxo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f30947debee7d6e8530d5dd35349e0ff/kabeke.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/7ioqqg19v0gfmt2rvip26b5q80/xedutel.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160890e21b7341---64843962834.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/55790477131.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/nezipen.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/urpuvhro96jbpcgucmar10cg2q/kipomenepukabomugesalof.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/gejosiganimojujedubik.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757de3a3c02---22771779498.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/zidabifedevipefovufar.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f3c68c4e4d49e4e72086e6ad01f1cb4f/texelexanajifexug.pdfIn PDF document text
    • http://caramelitos.sk/files/penumerapesololamas.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095299988639---6658338853.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/46033817786.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_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 10332 bytes
SHA-256: 45048c2cd839715225292ce02fd2b7ace90cbe6b9d35817bec5806c43b04a437
font_01_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 16820 bytes
SHA-256: 630715375cfd60b4398c11596dc303191540a213b734a45859ac5c4d5cb5b20b
font_02_sfnt_off00013726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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