Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d2b95bccdc7b7c…

MALICIOUS

PDF

131.6 KB Created: 2021-07-16 18:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 610b82ee475080c6601da1cf78bc17aa SHA-1: 8bd91b5b91c9384a34189f0bb542edf8d219c463 SHA-256: 81d2b95bccdc7b7cf3ad2a517454479c6f0d5ab1f3d84556425ab42c6714bf85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to exploit users who click them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/i8gmb4cra3n4ltpelb27nvpvpa/vomamenobuta.pdf In PDF document text
    • https://bandotrading.com/uploads/file/bolakediwumadofi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607f939007ac0---pulibawogupezezaro.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/65329740499.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/20876e52971393a5b52881643d9d2b98/14562429182.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082c70c86873---vanonug.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/vasakudenenaretila.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/dt2lt9hrnim9d8h5ku8lidsija/66727650752.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/zogokozozexafuwevigufiwo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66de160c1---92483626630.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/mofax.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/28931684691.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/28/miponekerotowawesetebu.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/tomobirutofuku.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160987766baffc---26214422376.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/68865819282.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b5b79086---95104730629.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/boxidesuxoneturege.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf1ff186eb---77873627138.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e9f44d4b6---47915198573.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e16ab3c96dd---kevobad.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e8c8d78687962a1bcabcde01fbac8d06/90849712472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dumping+syndrome+complicationsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0A2 11072 bytes
SHA-256: 9cf7ffb52a99f2ca48a1e1d9d9cdff62c12780918e8793eda5b5cee91db955c3
font_01_sfnt_off0001ba38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA38 18064 bytes
SHA-256: ea339a3907dab79c83245b3a49cf12400a151e0869fa17be9e212ab417995f65
font_02_sfnt_off0001e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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