Malicious PDF — malware analysis report

Static analysis result for SHA-256 390f8cb3a88cd244…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 13:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff70f6258b7b3a76b29c3db411a5b2b9 SHA-1: 1ae44ee09f242b10a51f4acba89af9f68f4d0552 SHA-256: 390f8cb3a88cd24477e0f733dbcb2f261f5452008eabe26779dc3dbd2c747804
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF links, many on distinct hosts, suggests an attempt to obscure the true destination and evade detection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://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_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

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