Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c312308c537713d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 00:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37f985a6b406d497a071de4d20bea118 SHA-1: 37631251729b1dbc6735f70ef3a4b8d508e0b95a SHA-256: 2c312308c537713d653c81a6346787cdbf0739f71b1bce3e0ce620ccfce8b3c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate this file is likely part of a phishing campaign or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zazum.pdf In PDF document text
    • http://masan315.net/board/imagefile/file/kotasozovofuzuroba.pdfIn PDF document text
    • http://acril.ru/ufiles/files/nenogulobafog.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/dutenujiweb.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16081243fb4f6f---xivupanesiletululapugogu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4c4a814b---bidux.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/29482125659.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/gijenofizefitaregakiga.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/zatebanopujeteko.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/kefokivovuvagikizame.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/sasifavuzetib.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/sisazaselatuw.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/83638701306.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/botegevotusap.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609150fa4b720---98333462944.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/5367965696093f97e0a905.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/zonevuzapegone.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/6008825306.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/farawakabeb.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2ea995d725772995c8c90688f7deb9ba/kopebekizakupabesova.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bdd71f117---xorekodoketexi.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/52945485934.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f714a992245---95006978444.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/lewijeres.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gktoday+medieval+history+notes+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_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 18288 bytes
SHA-256: 8554d0eb1796511117d1a19d5b6ef6af7d7178947c9799238df46dbb1c703ba1
font_01_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 11076 bytes
SHA-256: 122d4804b54b5acb5e72025ec32f7d2c8cec88324e1cd86a47b3e71423bb6181

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