Malicious PDF — malware analysis report

Static analysis result for SHA-256 d531b345137da015…

MALICIOUS

PDF

89.2 KB Created: 2021-05-26 06:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb72be9148763f66f09ecaa23985a755 SHA-1: 3b911479b8cf989e0b7c4130415e8f287db0b80a SHA-256: d531b345137da015f143a5f3e7e8738e58d93b482e515d82616b755f3d92a88f
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 CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/uplcv?utm_term=100+verbos+irregulares+mas+usados+en+ingles+pdf
    • http://firegallery.ru/img/upload/96638264797.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a433d181c7---gajazuwezadala.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/cnkisvsjqc25h8b2njjtenbvld/pirivibu.pdf
    • https://tolgyesvolgy.hu/userfiles/file/99543745310.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b23367b85---jabinosomijevixusod.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dt9ne9flolrap0hpm8ftde2t7m/8209252546.pdf
    • http://anjilh.com/uploadfile/file/%5C/2021050223080263.pdf
    • http://xboxheerlen.nl/userfiles/file/jifizonuxobitaranoka.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ajln6rfmdf7ssth81mqo274no1/64463038611.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceac6ba496---74288892770.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/nfd79ahiqfbhb5gb47lh8vij16/4353004850.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0899083a7881b37733626466fd40035d/tozodidanelitomu.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721f3595c53---jefixoluligowag.pdf
    • http://alemotta.com/resources/original/file/73492437137.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9867174245---piramodus.pdf
    • https://diedacorporation.net/freesiafiles/file/18505023986.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6ffd74a409e7510db0bb223f15e32733/dimaterebuzesapem.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa95f400340---85054018414.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b3e.bin
eac4eed9d72a38c9fbc9274b9e3ae83c41263d5511d772bc8a7d0f22cec2cb04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 5660 bytes
font_01_sfnt_off00012e6b.bin
73bf89d617440ccbfed6d13441c78239eec275efa034a86990c8383fa05bf24f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6B 12048 bytes

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