Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5c86e77c47c025…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 10:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f0d405a43797073a307257a10ea4c05 SHA-1: 1a030cc3c11613e360a4f983e93e86eb40d35141 SHA-256: fc5c86e77c47c0258d04e78d686c7b9f784b9efee1148d9573d85ad774a3349b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=isaimini+captain+america+civil+war PDF link annotation
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4c7d6dcc6011038b636b831005ac7ed4/veragadeforetumupoxonux.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/22728309614.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/rawol.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/kupivem.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/fevogilutobotekadixim.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/24022927705.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb95dd5f6c---gatodajavupo.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/34115157817.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/15326757695.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/16005825215.pdfIn PDF document text
    • http://scpt.it/userfiles/files/49755229992.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/54049538933.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/dorelejev.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161369ccca3994---60134373121.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f167477d9---80584727084.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/lilutolofesotut.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/12539854063.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/buluzusariliruvuvu.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/mupanekesawewiz.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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 18484 bytes
SHA-256: 106bf3642c233da72d78ee651e6b6239f318a092de7b94d8df47c9bb8323a294
font_02_sfnt_off00012a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A70 10520 bytes
SHA-256: e29d477f73d6449b46eae8ea46dea68579a2ec11bc3e5604ad715d6dcfad1d92