Malicious PDF — malware analysis report

Static analysis result for SHA-256 6271a5229b36da84…

MALICIOUS

PDF

78.3 KB Created: 2021-08-25 12:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd863daeac7bd5d7528364ea015028b4 SHA-1: 06ddc688b70420fa2835843c66584b63ec53df5a SHA-256: 6271a5229b36da84a71b113c7fda38d6766e8b08a562c1deb2d0b7a484da911a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to other PDFs hosted on compromised websites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.allterra.group/wp-content/plugins/super-forms/uploads/php/files/33d14ff1328062ff1daf605f9497bf5a/46327903379.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60c40ed97---70123027768.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210714120658_rhxvgj.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/81315074692.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/wegafomafisezoxuviveto.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160776e45c565e---44343874468.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/37929687070.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/84566068804.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/48765909451.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d432e9315c---weborasesomawavulewufizin.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607fda7b9415b---zixemuwifigurugokof.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/defegakeditixodejowo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3a68d55a4a8d679d2fb0d398b9171d78/sefijev.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210703211052_1ea6vm.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/182c37afc1bda108790526dd8c92a812/notabovowadubuvemegu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bda4fde6d79---rukevawefikamebofavan.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4db381b86---feberovaloz.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a281075c6571165a98dcdce6a2377e05/damajebanabos.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/4960386321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fire+emblem+three+houses+instruction+guidePDF 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_off0000d1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F6 16100 bytes
SHA-256: 058c6ca4137a0cf747b3607050a6403c1d405ef8bc7d17337cdefe8b61d523d0
font_01_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 10872 bytes
SHA-256: 6f91a4b974f00bc8a4886c2c929c1c7c54657176e02ace05d6fe49438ba8bd77
font_02_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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