Malicious PDF — malware analysis report

Static analysis result for SHA-256 139055b168bd1076…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 09:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bfeb8c9ad501daf12cce8c8aec521d48 SHA-1: a834da151985e2cff05031f6aa86b3ab9f572bab SHA-256: 139055b168bd1076c4df8fe1f8a9da806601c3b9844502beccafba4bfa929957
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b06afb708559da4b1bd90a9be5132c8f/rosewewagebirazekumijaw.pdf In PDF document text
    • http://xpressup.com/userfiles/file/vuxuvalelole.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbc1bc6b19---ropusejolexafibozi.pdfIn PDF document text
    • https://telorgabus.com/contents//files/zimomezevexuk.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/naduwowaweri.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/lukesaleror.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/26eaa399be42ee20ddf2b5c533e34074/madalujawufeba.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/ruwixazewarakesavaselijos.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/logotasi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4ccea4e1---fadipevumofuzowux.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/gosejokawovapomuk.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/23767910729.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/41719835899.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/xagujelopalenozoboti.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ccd9aeb002c774e4b746c151f49fadec/pisinibabenanozunevi.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/d163q6mk118e2qm3r6fsavmpc2/rorotawoderivim.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/32892267384.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4eeeab7d0da79658cd3cde22e724121/napowute.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/sikexovurugigapi.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16091bbf685207---bavirexigamesepava.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b8a479456a0c1b1f417bd0ce52126f5d/23404441017.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/jetisosofuditiwo.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/55264720384.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a141a213881---92934060580.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/1a7ur4uidqs9hbo21v9g87c7ke/36988751080.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/4873189390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=complex+sentences+worksheets+grade+5+pdfPDF 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_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 11420 bytes
SHA-256: a85a30d7fc741f7a9f0a1ef32ba3a1e78f55efb6ad5212b13ac6e484e1fc7572
font_02_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 16672 bytes
SHA-256: 88cafc3ab2168992e5820b550f81695f7daff70bcee2e58c79e601e74285f11d

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