Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8159c16f6851ff…

MALICIOUS

PDF

74.8 KB Created: 2021-09-26 02:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f154d1ad342185c4d408a437828668a2 SHA-1: a762c39b99e2c39da7fae9d910c8c6d59c53ebf5 SHA-256: 7d8159c16f6851ff782cc6295fffe67fd3d8bf41844b0df099af623f04cb598f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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://nomylo.ru/uplcv?utm_term=john+gba+lite+fire+red+version PDF link annotation
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/jetegeg.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/tidokaletabilo.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/7761662387.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/narikatobufarimakejaj.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fevivivugom.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/98567174350.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/2473522128.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/33487180448.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/76254120624.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/80484970030.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/gutuvixizusetofuzomuzo.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/lefoxudibegosugiduf.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142272aa76d7---73250292521.pdfIn PDF document text
    • http://edallyshop.com/upload/files/47772523457.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/fuxobas.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a4fb5f69a9e20a01c710791237b6e4ab/21224566344.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0b7a1c2263bb3166fb079f2a5be88389/viwug.pdfIn PDF document text
    • http://irinabailey.com/upload/files/wamifebumifi.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/95724728343.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/nemibasogazijowu.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/sikabamuseziranukusuxajaz.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/limisemekumadurimozuxul.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021985223569.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/lebagekexarapup.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000bac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC2 19072 bytes
SHA-256: bbf43ecf2f15e8b3f3dadf9d7892393b30022917c8efc049b2d8ac2a609241d4
font_01_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 10832 bytes
SHA-256: 2fa107bcd9a8bdc445333c357d3f3d52cbd499a56ed47efdc4b96d1bcb1262ad