Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6ff1108bcc3d51…

MALICIOUS

PDF

93.5 KB Created: 2021-09-08 00:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84811beb8cc6ecf4140501623d139a6c SHA-1: 392e3ba4bca6ae31075df62f600e36ca62f23043 SHA-256: 1a6ff1108bcc3d5175baf5debe04d66a89972ec3215ac8ed2fc50dbaf1ca0f07
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains a link farm pointing to multiple PDFs hosted on compromised websites, suggesting an attempt to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates a common tactic to bypass gateway scanning by requiring a password for an archive, which is likely provided through a separate channel.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cbconsulting112.ca/userfiles/files/tajamajoxenipapisegitukix.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9c09fa0028e6ff2635a354878c00ed13/69372843979.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608549f5b50dd---tisizivima.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/gifamokipanobixa.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a429732d894---74774569571.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0cf8495b9---gorelinomemujepuxonari.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/868h9ogg7tgqnginljmm8rnosp/mevaxebuwomepenujejesiwom.pdfIn PDF document text
    • http://jarosi.hu/files/file/kezewuxalozovesokodojujak.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/62141193952.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/34345500562.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/paxedamunewixezizixufe.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/vadoturuxexurow.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/vafizalometibira.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/34157004934.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c51d6acae1---verozivazegelanu.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/1279738535.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ririvavewugulozumu.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/bfce377e02761b42e86847fb9a9ba029/tebogigaxuzosamawajiwur.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/34962279118.pdfIn PDF document text
    • https://ckmandarin.com/uploads/viwufaxivelara.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/49158095877.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0a2a868fff0af0529b3e80ebf7502675/menujawuboximazeladofa.pdfIn PDF document text
    • https://kenadong.com/contents/files/75507149349.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/zaxifedifazupabek.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rjd9inlbqpadg1fb20mspjd9ps/46099672937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=convert+pdf+vers+excelPDF 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_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 10560 bytes
SHA-256: ac9040f919ebef317ec05c753b00d27370d706b4ca3a025a844e31772275676b
font_01_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D6 20228 bytes
SHA-256: 4c78c1d35648f533c00db4747fcc69429cfb261434c65fe71c0ac75fbde0b8d5

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