Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b997695f939e5a9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 18:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b6a5dfa909225c2101e499c5dd1806a SHA-1: 575ff068d7a5f854932a5f189a10b38ca3d954cb SHA-256: 3b997695f939e5a988bfa5823d94cc296a03ab27c51eb21a1d7137b2a1a26f2e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of ML and ClamAV detections further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit user interaction with these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df2126311f9---27904193257.pdf In PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/35096741290.pdfIn PDF document text
    • http://artside.org/data/temp/file/rurexenegonifukij.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f24b5c6140b2d81587e03c5f6ecc1bd0/zotibupebasoxun.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/o8a74un5tnheo4grnp0sbkumhu/zadesisekikefaduborebanog.pdfIn PDF document text
    • http://congluc.com/upload/files/90512949225.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/jasunubunikike.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bbdc3a3c3---41410138251.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/59369307650.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/af8d10b45df2ab9d7c67e760d806cbfa/widerikemalofuv.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ec6f2aff6fb89772fb82f5f1ffb9b024/8259747003.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/368c0eaf0aeb0e3375bbdb858fbaae5b/libakawalovesudisu.pdfIn PDF document text
    • http://momsystem.ru/public/file/xisidaje.pdfIn PDF document text
    • http://mdtrend.hu/files/file/xopexepevetobogofaxur.pdfIn PDF document text
    • https://bczenekar.hu/files/file/wosexatoj.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abdf981c01---55212962514.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/74de9f14e6102427b21731c65423efc8/zupip.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b165bf03b---72509100183.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe1ad4fb4---85859673866.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/44bff358d3c8cccc6a7eee3b69ee40bc/jeforilasovawa.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/00e189f74fb7b48f1e875ddbd1d464e9/fujorewi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/32aec209aae8a24e8cd35e40fe70cea9/vulemafinezerexalo.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/49325105518.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/zigulivudovunukijij.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909d0ce9091---21387087431.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/95007057717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=compress+file+pdf+free+onlinePDF 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_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 17212 bytes
SHA-256: c0005784df89ee344f25d7a5a601e78502dcda16b310662bdbffe98dbf439e60
font_01_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 10432 bytes
SHA-256: 4eff725b4791f7aa9a8d80ce10e8424b5bf15c03b7331df48902303d1141bff3
font_02_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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