Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bbb9eb97515e5f…

MALICIOUS

PDF

89.8 KB Created: 2021-07-14 04:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c50392f45f14e26e2f67594ebd77ec1d SHA-1: bc74e71c60d7cc5850bcf43e3c605edceede0210 SHA-256: 85bbb9eb97515e5fc4b1bae17626c10a879e1565a084c923fd4af51edd1d48af
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by ML classifiers as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host malicious files. The presence of these links indicates a likely attack pattern involving luring users to download further payloads, potentially disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec192ecfa7---57221361567.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/f7cedk8701bn173e0i6kn4tdtj/romemokazuje.pdf
    • http://wheatland1971.com/clients/25033/File/77944973641.pdf
    • http://alexlunacoach.com/img/editor/file/jubenesonakadewix.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/9gj1aatsuhbe5n9l20pdkiejl7/komefivigirufexivawer.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160754017649d1---vebarokululalube.pdf
    • http://firegallery.ru/img/upload/36770734010.pdf
    • http://mega.kz/media/upload/files/fujawamur.pdf
    • https://icbacademy.com/upload/files/64510035314.pdf
    • http://daoltrading.com/userData/board/file/soragelubibabuz.pdf
    • https://aravlicraft.com/cmsCart//upload/file/12379115060.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9384613e77d445b52e8223262957c8d0/78154467043.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c99d46f28cf---21310286084.pdf
    • http://goldenpoolandsauna.com/user_img/files/bazexufewe.pdf
    • http://fedime.org/imagenes/gotit.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/44299760270.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160926cb604e35---zasedumaroropeka.pdf
    • https://tempegaring.com/contents//files/gavejub.pdf
    • http://laweasy.kr/userfiles/file/xuxatula.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/7245f8e62948be5e8615840ffb60d8bc/67650980400.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210620134458_896687847.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6fd916440c---39995840300.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/muzajetumebikapepelebo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=english+formal+letter+structure
    • 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_off0000fa9f.bin
499e28a6924ac93b38b837a4a2a61bf235fc90d2da110b1987b6536680e0c668
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 10868 bytes
font_01_sfnt_off00011383.bin
1b62a5a50dffc2d5b660a9de59cf10eb8f291e501ff4f5d79ca742b765abef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 17756 bytes
font_02_sfnt_off00014216.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14216 16792 bytes