Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a483657bb9a767…

MALICIOUS

PDF

90.4 KB Created: 2021-07-05 13:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 60b1e51cebce533e9e2b9d1b6f43963d SHA-1: fdb6fec15129208ca471024ad67af62e36c55250 SHA-256: 07a483657bb9a76746eb9ffad043c7509a5710a069bf6faf9e5562634341ba1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS upload storage, specifically WordPress sites. The ML classifier and ClamAV also identified it as malicious. The presence of numerous links to PDF files on these compromised hosts suggests an attempt to distribute malicious content or redirect users to phishing pages, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbc616e62---gifewofesu.pdf In PDF document text
    • http://china-zub.ru/userfiles/file/56049220644.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/vulepejomapunatoxisab.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/12378736775.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/mibifaterozamilajozuvivu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac30d01a2b7---99848463471.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210624052212.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/vizepobagowi.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7iufc0acomebcjkti72bhm84ob/46994569729.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16097d6a8bc21d---kebikode.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/78440106096.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b276c685f23---14155578501.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/819159452.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160874a358c347---36603471996.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091635f1421c---bibugo.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/95946731348.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a2e52f3aeafc6de714a8562e43255a31/5619786577.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/c2lbmqs35o1go02st6ehrij3fu/61212038555.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7156761ac---gafoxede.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c199cc9f335---85242553420.pdfIn PDF document text
    • https://x-software.cz/data/file/72248080172.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/67440909797.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/54998310969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=is+cured+resin+toxicPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 17340 bytes
SHA-256: 0bb01f1c93b328ec05f3abc2fbc23cbfc0d50e342cc444c64139e0f1fdab2541
font_01_sfnt_off00012cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14514 10308 bytes
SHA-256: 9f1da2abac1c55565f8ce055f3fda3759fc2bc4f614872be788439e004865133

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