Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4204d39694ad284…

MALICIOUS

PDF

88.3 KB Created: 2021-09-23 15:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e108ccd6a1cc94dc7102dc3f980e1edd SHA-1: f3d9368b3ebde5a03de4b11a6c1cb783ef6006a5 SHA-256: d4204d39694ad2840c1de35194077d8e0df33ea094264d55c8178a2ae9d0a224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=list+of+yoruba+deities PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614615be3adb2---fapufomunavosofon.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16142a1a778ccf---26552596801.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/juketujexetobed.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/lepugi.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/dosogulizipit.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/sogosowujibujopelutozo.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/2t23f87vlth9i7fmp8lk5ba825/wagetaj.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/falexasawekewofazap.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vatarelufapixo.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/28920526936.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/sazumoruwakoregiwilotuw.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/mazivogupepimex.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/potuvibomivefi.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/duxuvotipupofogo.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/wikudanugubisa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d80424995f---vifojutimukitepurapulerez.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/4775960472.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/linug.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/fodatufu.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/6925403137.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/22091510137.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/73025637965.pdfIn PDF document text
    • http://mebco.ru/images/file/vofexemivaloxunupoger.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_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 22628 bytes
SHA-256: 7f74f6c8d53f2ab5d66f6531a55aab2425e923655ee3db467b0291e2ed1faac6
font_02_sfnt_off00013b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9A 10508 bytes
SHA-256: c7e3466022425c526b7e1c133e306358f0448b3a0a0280a07e772a5accd83756