Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d5c48f4193a5a3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 05:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0ff211e7eea5646598008f4362aff24 SHA-1: 4f2c610b508b8a85210e76f5bf38511bd501e482 SHA-256: 57d5c48f4193a5a3e8f6b5544d594afac99c3b990e1f93cd60c99072035a88eb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. The presence of multiple external URIs and link farm heuristics indicates a deliberate effort to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://innotek.vn/uploads/news_file/40931228051.pdf In PDF document text
    • http://davcpundri.com/css/file/48057280080.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/jutuvaratasuk.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/zotilopemirufovasidabibe.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/3254575662.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073993bc24f4---39193590720.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202165124649848.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9660173463---wofesilawoxo.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/dixojasigogemomisutom.pdfIn PDF document text
    • http://tercovci.cz/files/file/89047973318.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/61510531317.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/0ck594uejc9mo05rgtv8fg3562/25522779161.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/57320278780.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8295b57a6---10519545179.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/sv2qhip01caascasn2mfmpqjlo/38459681391.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5d542253---20290505422.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161341f56c7631---jatofa.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/44995373073.pdfIn PDF document text
    • https://isosklo.cz/uploads/kuvurenesafamaxorazurak.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa9bfe53e7---pepidajod.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ec52589fa---foxewaxetevoge.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160943148b93b1---84805092830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pdf+annotator+mac+freePDF 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_off0000ba68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 16928 bytes
SHA-256: b5dedb00438aaeaddd375a6bb9eaf0e6c3649cdde40cb35d20036fba2d6efd56
font_02_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 10332 bytes
SHA-256: d6dc6dacb1923306a5e5d5cfba205ba7fcb454dbaf4b061ca218631bfb01a358

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