Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3098831f0fd6add…

MALICIOUS

PDF

97.9 KB Created: 2021-09-05 06:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8992207bd970a68769a9c48536abd01a SHA-1: 65bc1ebf20a1d60b6782731c06cfef577d9eca38 SHA-256: d3098831f0fd6addca169aee7a6a5c93043c27710d6971f3369a7dd78d620004
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised websites and disposable hosting, likely intended to redirect users to phishing or malware download pages. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain sequences that mimic command execution, potentially to trick users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://eyetracking.pl/userfiles/file/surupawiz.pdf
    • https://hssanesteban.cl/files/varejabuj.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729bf2a8047---ripizujaxitumijorutazogig.pdf
    • http://engineersclasses4competition.com/files/others/dakonebuxozurumav.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/hf5had8cu7rv1b58fa0dd84sc8/ximuboxifan.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/52316279110.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/vigenexunimukisadunaz.pdf
    • https://okud-istra.hr/userfiles/file/turexefedaloguzenubiv.pdf
    • https://bandotrading.it/uploads/file/6348702714.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/11974266344.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/72734282076.pdf
    • http://yourbuilding.ru/userfiles/files/nefijosemoxovubapozovomig.pdf
    • http://laptopcuhaiphong.vn/upload/files/tifef.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160935316475dc---3656932109.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7ded662786ae4c26db90a55e0ae15907/zidudugarekujuxodujijatok.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078c76023267---juvupuxelunagudijokiga.pdf
    • http://fisioterapiasuzzara.it/userfiles/files/51054809402.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ca536451---7743256944.pdf
    • http://charmingcurls.se/upload/file/kurubedonakadokijatuve.pdf
    • http://doktor-okonski.pl/uploadimg/file/44815390838.pdf
    • https://noriupapildu.lt/ckfinder/userfiles/files/92810930590.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/86tlshgdan3risaeqnn6manq7c/33290093930.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=egzamin+certyfikacyjny+b2+angielski+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011500.bin
49eddb362cc3ac144f323f2958b0ddd32b22678ee139267741b1c200a2eec218
pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 19484 bytes
font_01_sfnt_off00014513.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14513 16792 bytes
font_02_sfnt_off00015d2a.bin
129bf0a667878ea8c4615e41256f9e5f3eb32f8fa454579b807a4485a30352d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2A 11480 bytes