Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac8d971a77f2095…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 00:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 172d4020f1d24219638a7f6571568dd6 SHA-1: 2b2b24ed41fa54422c922c7f840aca79b798a2ad SHA-256: aac8d971a77f2095fb98f807f38d2822ef6ae820aee6aea6f4b30a62ada3356b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also features a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7230

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/76181423682.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b35c58938---wogazunoxesatom.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116fdbecda3b---12710880721.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/67042899666.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jerovom.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210609_AB56DF70B546B1DB.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/7d6accd592ee9d07e666d2e6600b9b9f/39427074787.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/waxobexumudosofuvagetud.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/31272418499.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v9inj2g6ju14khp8e7gb93kjp0/zonovazunalobalosezi.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ffa83881---lokitewabewuv.pdfIn PDF document text
    • http://linker-apps.com/files/paludibepurafaradu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bka2c1dd8masujg0o9tk8qcbm7/fotozubixesetolewa.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075f51ba4cb3---tixowawewek.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fevvl42m4gsf2sm1ab6u43e8j5/sazezabanivuwesobezo.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/713a8kkks3i9fsoivophka54s4/punevapumuwesumujewavu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210502200153495328055.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/13061884187.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7d331dabc1854e4af1828efdd9f5cc71/rukirutuve.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210706_9D14A71A801F418A.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/69744240084.pdfIn PDF document text
    • http://muszempilla.com/files/file/11995635570.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/puvuzatisawonuwoxuwibop.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/88931958941.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/70318417032.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cd280c363---golomolobizoxas.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/16610818207.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7d989e51bf3cfdd3eb5275799a58afb7/givosopemepir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=movie+the+loverPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 9828 bytes
SHA-256: 9e94787b6d876114310ec91c7bfb4944ba4583395e779c031414f30231245464
font_01_sfnt_off000123da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DA 18756 bytes
SHA-256: 8be8f7e2c056781f94d7a02663009e8d78bfaf722ce4b5453adeffac6596e47b

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