Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef514fde86abfeb3…

MALICIOUS

PDF

84.0 KB Created: 2021-08-26 13:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acc56b6e537563e9a7cd38e796145f30 SHA-1: d88ff0e1c63616a215924d1af3ecc20fb3162e41 SHA-256: ef514fde86abfeb3311c527d07ee8e04e4bdd71657fde59053d94e5cc6ce015d
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 Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://wastran.ru/uplcv?utm_term=brown+tabby+with+white PDF link annotation
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/gpn4ji9mv0opldhk4kf9884de5/76768411502.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/45242006815.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/60100306521.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/36651481870.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/bodebajigofuxemova.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/929dc3d034bb3a8d56cff0913f3f3881/fefibomipomuregubadaba.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/unbncdsbo22iu4s37m2otrpk81/84286335076.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/badun.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/99730418569.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/87625962231.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/57183658566.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/84980052987.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/gedalotidoma.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/tororogubu.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/rawija.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/90399864991.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3d6a6062---sajabibozagovirogev.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb115d6007---vurufasuzoxedupazarukezex.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735665f15af---45651596982.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/vujojowunumulexodubagomof.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/diriluvekunevivebowakof.pdfIn PDF document text
    • https://chp-travel.ir/data/file/25267156083.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/fujumedakojozunad.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/lafepupozolepijukavesavir.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890e06dda4e---dobubipudatuvatuv.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a28a7175268bd092348fa950d4d37ca0/89952608778.pdfIn PDF document text
    • http://citra.cl/userfiles/file/zakaxasoxebobomaz.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_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 16900 bytes
SHA-256: 2ff8ec288160b1ac0c55c544d27a7300e7900bbb1d2fddec7a1e15f2dcd0dfe0
font_01_sfnt_off00011276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 10384 bytes
SHA-256: f4287c10ece088a6b140ee7a3763aa097e50541692bd6f4a7d2121aa3469f2e8
font_02_sfnt_off00012a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1