Malicious PDF — malware analysis report

Static analysis result for SHA-256 c197fb58d2798692…

MALICIOUS

PDF

86.2 KB Created: 2021-07-01 12:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 08d1ab0f05a164c406ed7fcbe6f5b2de SHA-1: 51c77c9d559d5ca4444789d3fd0a032b0d700e99 SHA-256: c197fb58d27986927bf44365c4e868e0c23a44255fe87705af3da7fa0eded1a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://coretry.ru/uplcv?utm_term=hik+connect+on+android+tv PDF link annotation
    • http://szsahsh.com/uploads/files/temikegiwokipog.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/nerod.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/seterenitenuz.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcfa254f3c---jekowekotesepaj.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d421c097694---zorufesokomojupuzosex.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qqg95ie8ur48ve2jktkk97djl2/60106426628.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/q3l2sf34ddk5nmupeasi5h6v7s/11956157754.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be6f0cd719a---26365210037.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/puduwuvusutibogisireso.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ill755q3ckbqbr7o8p9a62rkv2/zisinepimog.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791c08c1fed---zinisi.pdfIn PDF document text
    • http://centronegozi.com/public/94947840068.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/49pqj9sore1etraosvvokhjeu2/nenojawitomikaxorul.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b89616339d9---bijobowufetexo.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/gumaporupir.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d321b0c3---bememuvopesokimuribaxi.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/xapebuwofisebali.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/lixusipolewenopitafe.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/07947312a137d8ffff479f9f48c4f4b1/vosituvitufikatubok.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/44544889594.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/nikosenupapodu.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/sowukafelukejawi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 16508 bytes
SHA-256: 15ba873b3b7e0e25cec59c6152b93cc4c4a38b3c89d843418dbb66f90efe64f9
font_01_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 10300 bytes
SHA-256: 097ec5e8fc49f1a137187cb46633bec6d13c6b6f7f851bd81f422a2fa2a48cb1
font_02_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000142c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C1 1796 bytes
SHA-256: 4af1649e085aebf05ed08f2b3a8a5f6c9ae5e7c4e1958b57b9bc7c71355452e8

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