Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c29d9aebcb3d460…

MALICIOUS

PDF

144.8 KB Created: 2021-08-15 11:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02206e70d4c9c5ca3755862836925c67 SHA-1: 5303ed3c93de0b3c3e3beb09a4fe7df3f19e6480 SHA-256: 0c29d9aebcb3d46064729808402b47d8696b609d2a1dbfac2d385fdd9383cda1
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other domains, likely to lure users to phishing or malware download pages. The embedded URLs and the overall structure suggest an attempt to distribute malicious content or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.hzkontejnery.cz/ckfinder/userfiles/files/zexuladitiduwojuraz.pdf In PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611616d0ab41b---zolajelej.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161108b8402e44---64465822563.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d967fb120e---beridirujililexokofe.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b2466662740---54087326414.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/21510875088.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abb63424a99---65171575244.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/16776856848.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/81944361064.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/zoverazimunemofo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/jon3c4qfhrbiat6pqm2hqlefo5/79280727216.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/45836994579.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/75864603358.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/78340b950e5b17f580bc6d733a793fc4/forisome.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/31400739809.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/68847989177.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/dugadosujonidulove.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5vohjgj6najn99bu0c4f2keqn4/43803766466.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210810023506.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160823f7ec252f---97801775122.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/lemebafadasanuvukazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=xbox+360+e+jtag+tutorialPDF 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_off0001cef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E70A 20100 bytes
SHA-256: d1dd86ace5bd261b556ce09673f09f1fe042be90322c64215a176524b411e117
font_02_sfnt_off00021aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21AA0 10952 bytes
SHA-256: e11eb70a8d26966823f3262898996fa023628a3fa69b3f02590cd60535808de4

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