Malicious PDF — malware analysis report

Static analysis result for SHA-256 8507929bdb6038d8…

MALICIOUS

PDF

110.8 KB Created: 2021-07-22 10:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78372912f5e3293def47dd2413558e62 SHA-1: d237f6d32cc99c1773083cccf31b49fd17ec2531 SHA-256: 8507929bdb6038d8346eb297943490ea0dff1a717e8f0a0c3649967c7f9d53bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://veterinarycarefoundation.org/userfiles/file/maropamuwubobikuremi.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/55758381540.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/65001791075.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ce47fe215f2734273d7f7341b3b968eb/moxolelobumozedizebafo.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08309115fe---tujofararapomu.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/186848397760e57998b2787.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/0fd95ef97d895636055ab274e2403639/67477229033.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/novoboniwi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8d679468---75948306176.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/89a236509fc15d2564f4859c64e507d7/vililixozarevuwos.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/27367875015.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/f0qh0ju8h194m78cch3a9uso0e/xepaxojofuzoxiwuwif.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/fonifidojifazenarazekop.pdfIn PDF document text
    • http://jucal.es/images/file/vudinojizutevegama.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/17970963451.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/57a0899db05dc3ebbed8278c06671079/witavopikokuzesebigesa.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/ffa9405cbd9e95103eb48856eb097232/lesigu.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/xagurajomokige.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f016eadeba3---13650292105.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/xedikadelixitujijazil.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/newifesokesaxariga.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/82822820991.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/27950994003.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160975aebab0ab---jafujibonotosonaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=time+zones+time+nowPDF 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_off00014db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB6 17960 bytes
SHA-256: b396f007b4c3754233651f38e16030861ff897e6d49e4abc4221d72e89d64c72
font_01_sfnt_off00017cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000194f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194F5 10072 bytes
SHA-256: cf2958a07e118d7beaff3a33269207112e2af4f8ff3ed589528020c2aaa0a629

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