Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9cd1f08b0a6d59…

MALICIOUS

PDF

90.6 KB Created: 2021-09-01 08:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b5db68b4030096f29dcf39d634658f0b SHA-1: 0e7f026ca3799c6c53bc8c86fd36285244a9f79a SHA-256: 5c9cd1f08b0a6d596f93eb2da06a88d061d4f656afa5ea73bb66fd234bd04398
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=occupational+hazards+examples PDF link annotation
    • http://take114.kr/FileData/ckfinder/files/20210722_677365C19CD69543.pdfIn PDF document text
    • https://avenue102.com/uploads/file/lobasez.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/64808562050.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/5449710527.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e2579d51ce4---lasotumuwimufuv.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607792c2e4cb7---xudoluvijazezobodox.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210701_256DD710B23C5754.pdfIn PDF document text
    • https://aashianarealty.com/file/88632234250.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/t9ukc8mgksma17ttqvo9siuoo7/72360272552.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/51765884398.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/refimukelixeni.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/88918543504.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/8511874878.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/vaxugozusigolu.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/fojimubusatuvetakojaka.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f38857c907---72064238441.pdfIn PDF document text
    • https://melz-feu.ru/upload/sofoxozubiwizivizaza.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/n9e3i4bfd3qu8ktcmg53qr44o8/46516445443.pdfIn PDF document text
    • https://medtek.vn/storage/file/pedivosufixajad.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/julipe.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/jizoxikiv.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/ziwefitaputipurewom.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/rupir.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_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 18076 bytes
SHA-256: 897c9733342783ff6f77161c1be70cd3bcbc885c92ece5c818c0fa0ab3582126
font_01_sfnt_off00012aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEC 11068 bytes
SHA-256: 65a8e0e8ae902c096aa68fec35a9862fa51e6831eaa05f5370a901cb096560c4
font_02_sfnt_off00014493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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