Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a0cb33d4fdc7a6…

MALICIOUS

PDF

73.9 KB Created: 2021-10-04 12:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4906a74a8c75737427409d781c8c02e8 SHA-1: 6e60c461446f74400fe3b00cfc80febfb40f2c34 SHA-256: 64a0cb33d4fdc7a69ab4a4d4221bcb320060b9f669e4e373b5a1256674b11d3b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pixomot.ru/uplcv?utm_term=where+to+find+eye+of+ender+in+minecraft PDF link annotation
    • http://bburago.info/admin/fckeditor/userfiles/file/86656438958.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/61326477774.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/83210492314.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/kawiwilitetemuwa.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/17240383527.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/77045300774.pdfIn PDF document text
    • http://gardatrans.com/content/Files/43430923591.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/32471593184.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbda0200c---62139543249.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/16340625461.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/68d53bda0557c4c3dc57b7cc5afe06e3/45183485217.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/luvobafutipovogeju.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/mubasiwivepa.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/jamarego.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/wadafizaxoluwarupara.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/kanigipareraxize.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/14251574936.pdfIn PDF document text
    • https://renetravel.ro/images/files/73731837056.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/16014310764.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/vojovaborekapoxutume.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/ratibibulepifugoxunodotik.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/sowizukiru.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/db4e0557fe0b62e219c6b2f3ea547655/71131322480.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/99384579443.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/dameruwevagefawakonogo.pdfIn PDF document text
    • 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_off0000be9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 10636 bytes
SHA-256: 06c8f83a3690db6de06992310c381aa676254675a8b61b2df44d82f7436057c8
font_02_sfnt_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 17020 bytes
SHA-256: 1a7c0c7f34586aed4a2dc73f9db419a4dd712c64c7a51761cfeee6865a3c0e1b