Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b67f59cc4d1c6b…

MALICIOUS

PDF

99.7 KB Created: 2021-08-16 15:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5983499ae3499f04df367be7ff27a4e4 SHA-1: 38ba10a9376b040a1278e93c9cc0afaeb8cc900d SHA-256: 94b67f59cc4d1c6b8555af8853c178881d76d42661487bc8501920231d335c6b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://huntic.ru/uplcv?utm_term=aws+certified+solutions+architect+study+guide+associate+saa-c02+exam+pdf+download
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/vififufisos.pdf
    • https://europartner2.pl/uploads/jikubomodufevodegebisu.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/7990i30jhktfo1me0kivp3p971/28458451713.pdf
    • http://tokyo-sanritsu.com/userfiles/file/33063180403.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1622e49c0123b772856f1c143fd81653/95444848798.pdf
    • http://teusz.pl/UserFiles/file/pejavowuvasuvexulokubi.pdf
    • https://zahnersatz.pl/userfiles/files/12563313752.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ec69f95e608509a0686428c11cf74b6c/vomerisigujexitaf.pdf
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/korasaridakaf.pdf
    • http://vinhthuan.com/upload/files/29164538559.pdf
    • http://www.wiz-fac.com/uploadImg/file/vexuwakakumisafikum.pdf
    • https://opsclown.it/ckfinder/userfiles/files/wisopikigetenijixagujena.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/06601477db1b5500e5be88a1f7c9681c/wajavolevexajozolalem.pdf
    • https://ruh-center.ru/userfiles/file/xiwifiwavokaduzumuw.pdf
    • https://pasarangroup2.com/contents//files/82421411856.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b698d8b68---gifavasowiped.pdf
    • http://divapharma.com/uploaded/file/16747284136.pdf
    • http://sivam.pl/files/file/81582855847.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160969aa71acd7---15885225629.pdf
    • http://ipea.kr/userData/board/file/32622012634.pdf
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/97786313194.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa49a9087e9---zuzapomozufozazix.pdf
    • https://walkandsmile.com/userfiles/file/53164700707.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071eed55f6e5---53378122372.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105dc.bin
680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb
pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 16632 bytes
font_01_sfnt_off00011cf1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 16792 bytes
font_02_sfnt_off00013503.bin
438a38789b5c7d5927298ecf655a1ec62bf21af3d22e0899ef9d0ea88209b108
pdf-font-stream PDF embedded font (sfnt) at offset 0x13503 17188 bytes
font_03_sfnt_off0001617c.bin
5a0746d8d7fea74c9aa8b0acae91e7179dcb004d0821e46c19d5be6c615afc4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1617C 11728 bytes