Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d4798edbbdfcdd…

MALICIOUS

PDF

71.1 KB Created: 2021-10-02 21:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef2d6eed3709f979d3c3d613c7c7a6c6 SHA-1: 509b7a7ad61fe459d2d09e129eab10e9e460fa67 SHA-256: f1d4798edbbdfcdd90d856c291f8d678c17bde4dfcad88e2ab619f598fe7038e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of multiple external URIs indicate an attempt to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://umffz21.ru/admin/ckfinder/userfiles/files/84617561132.pdf In PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/60256601851.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130634bbbe32---49286012279.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/68e973f85821cf1e7aaa72356b1f66af/kupiwurukosipurakekepu.pdfIn PDF document text
    • http://24cvety.ru/upload/files/japozotilisaloro.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/zapipitegepopefatuwuwovej.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/31209995723.pdfIn PDF document text
    • http://bionazorat.uznature.uz/userfiles/file/daxetefiwosorewofitidimew.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/25304521128.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/17399757111.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/73148939152.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/67108884915.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/xutekataziluxesa.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/66163822303.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/lewebalemuri.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/zetivanosezaduvodogumuz.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/pugovewowufevexazexelato.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/dosulokoxolaxevefovowobig.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161524c8ede73c---runakomufovozanifetemurut.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/rutag.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/bepiguvi.pdfIn PDF document text
    • https://0900107678.com/upload/file/92120210037.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161465949bb96c---mawurumobupunuzijobanuni.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/waluzaxolawimemidodik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+turn+improper+fraction+into+mixed+fractionPDF link annotation
    • 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_off0000b4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BD 16172 bytes
SHA-256: 5be72567c144a0d9980525e3b168d8cda570ac290bdf80b5d63cd2a30e209d57
font_01_sfnt_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 10848 bytes
SHA-256: e9f387883669f9e6f3bc66e0b35e65c272c40b6ace133858b6b96ce51e5fee34
font_02_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1