Malicious PDF — malware analysis report

Static analysis result for SHA-256 d670d25aba701254…

MALICIOUS

PDF

80.4 KB Created: 2021-08-01 14:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37c645fb49527271bc864eb7c628dc75 SHA-1: 2affc6a372ac476b5e1c3864c7a6e80f68fd882f SHA-256: d670d25aba701254279c85b658148ab0052688b049ee09c48632d70f12b5ff82
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to host and distribute malicious files. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://flyingfish-stay.com/userfiles/file/84887460603.pdf In PDF document text
    • https://cmsschoolkg.org/userfiles/file/kapex.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48424696c---varudolenibivetatam.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ea4303ceb190676d9a81e9d2feb1c179/85266367146.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/uvnbvrng3msgr4t56k5ntdnn4h/pudowokuloka.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd51404ae3eb5256198b4a6e58503f99/sujidokimipivozevisaxe.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/24sf3akjl8saht1cukjfuied10/naxorunajuvogopozir.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1fd8b40c9bb8674ee4a607ece971587e/87409131765.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f7250eb10869b6116780ba447434b2d/sojutawumevajawujak.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/31657420211.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/12193565415.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2091ee1d3f---bemax.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051618563944.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cae11a98b---96800836013.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/65395518991.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/21749227321.pdfIn PDF document text
    • https://beaszemin.com/files/30598260310.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e13aa5f2240---satesiwew.pdfIn PDF document text
    • http://cascad-trans.ru/files/pimogegalax.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/53502438054.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/93516051613.pdfIn PDF document text
    • http://ibb-online.ru/f/file/fugewejezamidofogezux.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091091fd7301---rakuwovituta.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/4543772319.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/sixorasepevenufepabud.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/31490862604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=luka+chuppi+duniya+song+ringtone+download+pagalworld+mp3PDF 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_off0000d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 11480 bytes
SHA-256: cb64b2e9c4259345bd6fbbced03f6fb23af97fab22439e5e3e60b79dd8055fd8
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 16696 bytes
SHA-256: 3187bd1d5987245559155a6b9554d5e43f49f4949ba300463fc2155e6f7e223b
font_02_sfnt_off00011afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1