Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a04ec7cc91fd2c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 13:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f6e6dd85ce3753436b08a6f107b7f8b SHA-1: 4214d19ae7ff083d7178a2dc8a48b14e71f1b09f SHA-256: e9a04ec7cc91fd2c05b06d1a3838734b761abc1deda8becf0f141af9d9928100
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pharma-tools.eu/galeria/file/15722185631.pdf In PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/58717665788.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/tiwilisiteramawuraw.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/muratabenijaxulo.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/nodabanosuzezas.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/vegak.pdfIn PDF document text
    • https://isleo.com/i_photos/file/13426641710.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9528de3c---62552281499.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/51925391313.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210906110217.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/slcqhlpkqokch9l121pqf56gl0/54011658268.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090112481473499.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/womevupabafive.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/99297763063.pdfIn PDF document text
    • https://netlandschool.cl/files/xazim.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/gajenafugakoviwes.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/34293251852.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/guvogagig.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/58285167563.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/wobopadelovomapeda.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136346a7a256---31191939218.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383ae9f2e27---kibesadozekupotidar.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330fd7115b0---79364004773.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/gidivipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+merge+pdf+files+applePDF 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://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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 18080 bytes
SHA-256: aa444dd183c49aa82ff260fa2dc33cfc28aedaceb57364647ed1732179103a10
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10812 bytes
SHA-256: 261fbf5a0599e0211b31449a44d2aca1732f37a50febb04a5a945b3c4d2990f6
font_02_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1