Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a742349b273f1c4…

MALICIOUS

PDF

77.8 KB Created: 2021-08-30 02:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed239ea7f85d5570ba0d5fa16081da99 SHA-1: bc3269f84709023654363ad8d0947b74e60fe762 SHA-256: 5a742349b273f1c4b2af7387d18c15058ab12b583c5cac68e5bf5e1d6e320a45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/trhpki323b8noktfdluga41ti2/wewuragigi.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa34133c25---xalizawusos.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3katusgb7etvluq5fr20drtja3/pefapimarinadifa.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/40195019103.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608293bc9597a---53823468358.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/paxasotimis.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/13528870575.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7ecfd2d54aa2f760bc8917fef394b384/zogodojulo.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/oesq6v1vnkjk50otmpmf3jm80d/sogarovami.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/63220554601.pdfIn PDF document text
    • http://steinemann-ag.ru/84142975430.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/82035884827.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/wufilogamofusezotak.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b03f156af84---99064235323.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/12488953549.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/71702670767.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/83268477381.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/domorewonewif.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/razozevopifar.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/sabidefafi.pdfIn PDF document text
    • https://proxus.nl/file/nolozeritifiponobanut.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d74bf31cf9c681cf8e44434fadf2bf93/30575551894.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/javevubizurof.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6f194137a---wajisowudiguwe.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/mafasezi.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/xorovaliloxepozuxexum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bliss+english+textbook+class+10+solutionsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 11072 bytes
SHA-256: 3621c1cdebcb8a68999f6233aaac076a6fabea06528deb2340b10c4d83646ace
font_02_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 17096 bytes
SHA-256: 68a46a56f7508800f0fc832c0a8ec52cc2f25b37d443f05ab641c7846268cb9d

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