Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c891514d9799b6…

MALICIOUS

PDF

92.9 KB Created: 2021-08-16 15:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7357f19f353ee4fb1d115c661004f2b SHA-1: 9b6f058761b7dcb352b78d7ca728945efb43cb0f SHA-256: 05c891514d9799b6acb41d05581389e0d960697a4fd85bf3de7e62553e13c9b2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and exhibits characteristics of a phishing lure, specifically referencing AWS certification exams. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The PDF structure and embedded links indicate a link farm strategy, likely to obscure the ultimate destination of the malicious payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3636

Heuristics 5

  • 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
  • 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 PDF link annotation
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/vififufisos.pdfIn PDF document text
    • https://europartner2.pl/uploads/jikubomodufevodegebisu.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/7990i30jhktfo1me0kivp3p971/28458451713.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/33063180403.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1622e49c0123b772856f1c143fd81653/95444848798.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/pejavowuvasuvexulokubi.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/12563313752.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ec69f95e608509a0686428c11cf74b6c/vomerisigujexitaf.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/korasaridakaf.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/29164538559.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/vexuwakakumisafikum.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/wisopikigetenijixagujena.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/06601477db1b5500e5be88a1f7c9681c/wajavolevexajozolalem.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/xiwifiwavokaduzumuw.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/82421411856.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b698d8b68---gifavasowiped.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/16747284136.pdfIn PDF document text
    • http://sivam.pl/files/file/81582855847.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160969aa71acd7---15885225629.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/32622012634.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/97786313194.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa49a9087e9---zuzapomozufozazix.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/53164700707.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071eed55f6e5---53378122372.pdfIn 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_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 16632 bytes
SHA-256: 680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb
font_01_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13503 17188 bytes
SHA-256: 438a38789b5c7d5927298ecf655a1ec62bf21af3d22e0899ef9d0ea88209b108