Malicious PDF — malware analysis report

Static analysis result for SHA-256 958dfc6b0902f8b9…

MALICIOUS

PDF

74.8 KB Created: 2021-06-27 04:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32ebb2f218e277aad8a2ae58ca7d4005 SHA-1: dfacbbf5dc9c78d115318b19f15d431955677d31 SHA-256: 958dfc6b0902f8b906365c54417c58b25e62c347f21fc60dc4d04e12d2140b72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 pointing to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to distribute malicious links broadly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=triglycerides+and+blood+pressure
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b31432cb56d---ketabubovigodojok.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088655cb8945---92802074757.pdf
    • http://kibbkw.com/uploads/file/82220535391.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b8c3d366---bojativorinekiwowajejoma.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608776eb34409---kojowobedubakegedikekobu.pdf
    • http://eko-inwest.eu/upload/file/30589641399.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6601d7cac---ramonakan.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91171bb721---soxivufizos.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kmj3ehc20g6qudf90e31b7ojt1/fukovivol.pdf
    • http://bpabv.nl/uploadfiles/file/telemabemokuxowizepifelut.pdf
    • https://systematix.pl/userfiles/file/xixapifowet.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9afa197cfe---46515512851.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6797ae75b3---zobameraruwu.pdf
    • http://bakoca.hu/files/file/vibajokotuwipibupes.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096addd688e2---42342336009.pdf
    • https://roomart.uz/ckfinder/userfiles/files/xamolu.pdf
    • https://aspaeng.com/files/image/files/35223965678.pdf
    • http://akicgiyim.com/userfiles/file/dalavijimodobudasanexemix.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/2638c7214034ee3513fc0cb725942f9c/96460388210.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/23417897976.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/efcc2677e57aadf766ccf4fad78ff888/titemu.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/bezotawowebaxukopil.pdf
    • https://ijmscr.com/ckfinder/userfiles/files/fenitijusarokeg.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/98868092e44cf57510f06c264f89302e/fuvupobedawoxiwelimujado.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0db2035adda446bbaf6f3577305daa98/lufogab.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_off0000c2ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2ED 16792 bytes
font_01_sfnt_off0000db04.bin
2e957a66707df3f3514784cb15480b6d7191e3fc4c7a2dd12700ca1bf140aeb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 10908 bytes
font_02_sfnt_off0000f3e2.bin
c8d49826527cae6187b825a0f94ba7a5671654b96cf74eabdb25669f56995b81
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 16372 bytes