Malicious PDF — malware analysis report

Static analysis result for SHA-256 5803366e5bb56437…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 11:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c829ebb06cf3b45f0657cf22a9339909 SHA-1: 923e49e1f6d769dd1d2f5d69246d0833006a7444 SHA-256: 5803366e5bb56437a37d6a877a06107c76990de9941d7bbac2cc15b5a02f952c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to direct users to potentially malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple distinct hosts and disposable hosting suggests an effort to obscure the ultimate destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=perfect+ed+sheeran+music+sheet+pdf PDF link annotation
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/06tj87tcq7dq35munjj2l87lq0/fofomemota.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/89358040209.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/biwuworame.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107300248532475.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a439aa5dc8912c9fbef09c961dfdfe5c/37364613984.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082faa9b5637---kizaseteb.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vq3dflrc5tdskb0amn2ih7s93g/pojawimepiwiler.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d529889c25c---92812079241.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/lotarulivo.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607545765bed0---razatoke.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/98fsgen8uatcba97bom70hnv5s/3141773871.pdfIn PDF document text
    • https://nada70.org/userfiles/file/jebujixojimojimo.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/pufefekinavab.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/hvv5kn8noluaojjnrhafoe8j2o/pilaxonawefevugasixiles.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/74a759054cc39d20ef677cccadddb5c9/83415520342.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/bozebe.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/kakise.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/nafemudimuzer.pdfIn PDF document text
    • http://amandamaitland.com/images/file/rarakamaradet.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/bovatirobelenukalukapez.pdfIn PDF document text
    • http://seamacros.com/upload/file/foxufaromikagidoxulara.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_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 19588 bytes
SHA-256: 07a12f57769295713f79e80fbf1e0c27eb26eebf8c7e965e605ec080a6e0841d
font_01_sfnt_off00011b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331A 10820 bytes
SHA-256: 3dc21108e9001d2881dcc70f189a954cd570f4e72e4bd14302c216ae094bbefa

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