Malicious PDF — malware analysis report

Static analysis result for SHA-256 6968aa7f80d040eb…

MALICIOUS

PDF

71.8 KB Created: 2021-05-31 06:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e89aa3628d377b65f9a38f934d3eb49 SHA-1: ce9804043a4198b8a296a9965aa07025ebc85f96 SHA-256: 6968aa7f80d040eb89ad9be2cca6d61127dc7f3675bd77bc78ec1f84d62b104a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body, though heavily obfuscated, contains references to 'Sony Vegas' and 'descargar', indicating a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=sony+vegas+32+bits+descargar
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af587dddf---14380743338.pdf
    • http://animalscipublisher.com/files/upfiles/file/wivagapumaj.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/suwofuvomurowepix.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5bd957bf---18067480561.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/380716e313acbf40253062013cb93f32/xuboxiwiriv.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/mefuso.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081aa5dff8---68972343489.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/pedanobikaduwewopadeko.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac6411e123---13096739870.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/3e04771da13cc0cdd91cd12e92df3a1f/5637734345.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acddd14af8a---ludivimuxobekojebesamo.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d7765876c---virapa.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b352849c66b---49638745547.pdf
    • http://zabradli-znerezu.cz/userfiles/file/dopokilizodemidowen.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/4568741557.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d764.bin
9a732f00538e98b55b6ad1531a47d5561b35bb8c1f3bbe1ec133f9813cfa9d2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 5776 bytes
font_01_sfnt_off0000eb24.bin
45f1b93d5d7e3472ed18b4009e67da6c83ff9021e1f5ca026f18ed45e2d5ac18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 11660 bytes

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