Malicious PDF — malware analysis report

Static analysis result for SHA-256 3418dc94dad76bb6…

MALICIOUS

PDF

80.1 KB Created: 2021-06-16 11:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20d512c4e2b914a18b591fd35f48adbe SHA-1: 3846b22ad1ac2534170c33b6db9fcc2d0d0a8040 SHA-256: 3418dc94dad76bb657f22864a6e53f9ac46295f8e6714328ecfd334845a7b7df
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a password-protected archive lure, directing users to download a password-protected file from a compromised CMS upload or disposable hosting. The embedded URLs, such as https://allytemp.ru/uplcv?utm_term=rick+ross+sorry+download+mp3, are likely part of this distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=rick+ross+sorry+download+mp3
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/11c189a1baec59ba64819137c1cd557a/51237528998.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9221fec21e6c70a2e140496c1f9d7fa5/46926888164.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/de2806c9cef60766bca8836eb52ce5b6/betujifobusojelapimu.pdf
    • http://93564497.com/userfiles/kiruludotalidirowinorav.pdf
    • http://gd-weimi.com/upfolder/e/files/20210530221608.pdf
    • http://romanakladatelstvi.cz/userfiles/file/9000867050.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb79cde492---ririliboxifegibipelarud.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0gf74cmse154023p6q3i089q54/57465339576.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf44a7aeb0---51428362303.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860cf0b88cd---rodibitetuwuzivuji.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c432b012fc6---rakubifam.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/34oltqsja7hgu518aglkueg9c3/moxozimuvixefazukenusunij.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b633b6622f6---totigojakujaximulatunadi.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bb66f855---murokafuvezupudem.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/kiamuulqt1c2kna7olg08fe0q0/5961676210.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/pituvipujilonoratexetiwa.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a5ff3c89---27218211259.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/de12e05c96ee7f2f67e21a7608d9aa53/23537422262.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73f.bin
914a283d9726362c4344a091a2b3b0d80798ee454cc3876420080389735b8298
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 5648 bytes
font_01_sfnt_off00010a86.bin
9eb0e361efa546d223a910ae6e508f06aa7951ff7abd9e3229ab6be7c1f42c22
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 11884 bytes