Malicious PDF — malware analysis report

Static analysis result for SHA-256 77591ec33d5161de…

MALICIOUS

PDF

80.5 KB Created: 2021-06-27 11:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9338d495b0fc2285d38bfc22e133fdc5 SHA-1: c1b2ab7098789123023336e8e7197305ff7bccc2 SHA-256: 77591ec33d5161dea259a93c5b7151bebf1c00d812cbec77270a73c05e85d734
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a83cd1af072---76057101149.pdf In PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b826100f1---429151166.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/toxogokarugezop.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/48808472569.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/77200872161.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160824759cabbd---78639303354.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/45267018677.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/45fe0c3a30de183184bf346cc477b9f6/96938335848.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d7664662f5e965fb29b48fca22ad3751/panopukenedododoperilu.pdfIn PDF document text
    • http://stroi-sistema.ru/img/73742424464.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/20fd9d7cc09fd4d86bee1580f73c1859/30071882489.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5ab15a77---70144153446.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ca3fca1540ed1dcb8970202bcf3ae506/18788680873.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/63879586229.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/526db669dc66c0b7301f42571e27fd99/91563568638.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/gofalipubo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2090191ee---2910777880.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/19367075742.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4affa1fee7aee9e56af11ba91a6c9f07/nimuvefokomedasaki.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f424b4dc3f3a55301ec460f8e7458360/55811742541.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/wazese.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/xexutovoterupexujegiv.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/rolaw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608287887cc4e---15340286605.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ojpfnkacjae888pbohr4ft63on/vewoduruliropufumodos.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/rokewikidanuxerodavep.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087fdbf0b082---27760979529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=listen+to+your+heart+roxettePDF link annotation
    • 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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 17080 bytes
SHA-256: 0bc661fec09cdc45c19a857e25012848378ff46763777320bfbbf5daa6cd9ab4
font_01_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 10432 bytes
SHA-256: eb88a4513f057aa9e74003747aa5437e3d6f86d1783b02b937caa9abe566c42d
font_02_sfnt_off00011b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1