Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bf5e3a946c0162…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 10:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 956a7980432ec547e8f14f2b7d5525a1 SHA-1: 2185d28c664516c8215bce4a2fff51871fdfe71d SHA-256: d7bf5e3a946c0162d45d5f47809ec610fcc71a38c4c4d4aa0af6920e43b72cbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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
  • 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://infrive.ru/uplcv?utm_term=azan+app+apk PDF link annotation
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/wojajubelipipanifuj.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6d9d9501b13d0f87bc5042911f064871/48660699623.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/16776354758.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/7246780500.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b1195268c---45742778064.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac4556281---17785035297.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/zivavaxi.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/mubatexurer.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/kejafoniranijapawapov.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/dodorovalopi.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://shahgrp.com/uploads/73003811226.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da56f37391---46802664230.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/xupoledotewagosuge.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/94208598065.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/pibak.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/nibupe.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/65652157679.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/87863153334.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/58756377447.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/87883360662.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/3396145093.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/47538312900.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/bolejejizetobod.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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 20628 bytes
SHA-256: 30706a6957fd6d26f1c4c4929653fc5c05c5dbbec429e84e5599b9dbe1c31fd5
font_01_sfnt_off00011f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 9624 bytes
SHA-256: 3dfc1cb61ddefd8e1cfe7e503c1969ad28f37f5f7db27e4de6542a16bdc0e5c1
font_02_sfnt_off0001346f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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