Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6744c48abb8dd6a…

MALICIOUS

PDF

93.1 KB Created: 2021-07-03 18:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 131cb5b17887f0561cae0b1324100439 SHA-1: 1d9272606fe58751485096b0583dbef0ac11c68b SHA-256: c6744c48abb8dd6a628c6da4e59bf34c6d34fe71475dc7fde11fde9f77a5013c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://hglobaltour.com/FileData/ckfinder/files/20210702_892E88DAB520A9DB.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b096201994a---kuwirularum.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/jelexukif.pdfIn PDF document text
    • http://irths.com/upload_files/files/76413302637.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a3309f08c3bb083cb7ce613bd4fcdb5b/vogomibubinunazis.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160720d5807bd6---divoliremuxuminaz.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/bhajsb0g4kqsju287ub05k5j67/39677709675.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afe5be5be---63098287914.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/34986876293.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/faderaxunevukefisuteja.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/23c65b2764e1fce95ad7692bef4efa31/jepazogodurozolim.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/754f619afc5f97b78e1c42ed8001337a/subowobajebibilobisi.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/99994573331.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/luwares.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/77307168340.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/vevululol.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/196gdps2neoi9c38f7bjrl3ep6/84459025338.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/18199283276.pdfIn PDF document text
    • http://c-six.it/userfiles/files/71663102708.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kkrqi20sd3ncv3s5fe290tq0rn/13926964596.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/01jum2tvbggqpsbqq9ltqvofc6/49971153389.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/39496981687.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087241893742---36283374191.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2271c1651a1d6a41e288a9be8df484fd/lowazalamejexufol.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/rvsvlvpavfv2gj2gg7ngc2pnv3/jorodasevex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fable+3+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_off00010b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 10224 bytes
SHA-256: 4d9f86fc6e3f3402f136a1fda05b2e0bf4dc0f6534ad17ddecb38aa81c716b6e
font_02_sfnt_off000139fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FB 17484 bytes
SHA-256: 0c6a37bc7c79bdd1411b0ea1e36ee4f62c26cd664bb33dc78a7cfde2daade2dc