Malicious PDF — malware analysis report

Static analysis result for SHA-256 353d293eae31e3f0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 23:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b498c8217f5da58f13017b9b4b844da8 SHA-1: e48d4fe650e081f30e4ca34f711bf0d80d637753 SHA-256: 353d293eae31e3f06d5795394cee8f5f757d04c9ad4a1421f6e86dc482a27145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on various domains, some of which are associated with compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest the document is intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=economic+growth+pdf+weil PDF link annotation
    • http://www.pepinieres-gey.fr/ckfinder/userfiles/files/gopujawutunapom.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/jajenev.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ce12dcfd5f9429dc84f1b595bd084edc/migobivaromudexepabijobew.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc287b58a3---bisewegunopemazojif.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/89953694984.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23ac4de50---wejubida.pdfIn PDF document text
    • https://agermag.ro/mm/file/pofotesebadunus.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/25530632317.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/80915607932.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/88020083106.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/vosanufosuzine.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9d3b4620c0a18415f4b4592a0450bc1/lixutamujudazafez.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de434b91ac---xonatunudusob.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/kudoje.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/tezinipunemawokutigisu.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/giwuxolavefipuxudemajokab.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/sovobizerepodegadu.pdfIn PDF document text
    • http://bulmarconsult.com/files/kititidokijativibuxib.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/jivikubusemunawogamojade.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/29520732623.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/61983651633.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/mepegukazeg.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/pixefugomafowimisepadori.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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 18364 bytes
SHA-256: ce393077efec2b42b04184457b3a865c8fb9f2433b8bd4be8ba44a8a2026f1e7
font_01_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 10808 bytes
SHA-256: d2463f2a797263b039f5137524c121602bb67e69c08b285321c31f496ff67ea3

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