Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6de5790b191abb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 08:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4fe3176fb7354a5b6011b192e97dff6 SHA-1: 002882eb19aab7197ed3fb00e989c26878142a5c SHA-256: df6de5790b191abb8e609e87d939f61e03f9c7a1266bc72764c73139709dcfb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://medvor.ru/uplcv?utm_term=always+with+me+piano+sheet+pdf PDF link annotation
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5d64aca6363d2bd1b289735fa19609af/mobivimexez.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c0605b0554ea3f847dd758dd7eb8faa5/32030651823.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/81096726176.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/depotaleropu.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/jotugaledusona.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/bozizaze.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/93268629224.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c18ae0594---59900499667.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/fidexo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/67fe4670d815189eca2e355b2093e113/81400616146.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084834ca2666---lifisegewirezudeb.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/gegukadenugenitilipuwu.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/14007671827.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/28286742934.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/8bb4e72483b75a998c2c8b2e6a169548/56476844568.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d408ec519f---63987095876.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/dudobavizubegegugemivev.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/bubamuzokaxetuwu.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/55500715383.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9426342e3---zudituvasori.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/46209079387.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/55139984260.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/mubigim.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_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 17652 bytes
SHA-256: aa3ed84654fba8a97e1d889896e829f1ff389385f492f50dda50ba22434ddb09
font_01_sfnt_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 10844 bytes
SHA-256: 0a4e6f32a40dd2b22986510f3b53f32700b66fb4f8b75285614dbcf5709a031a
font_02_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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