Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e85fc28f851580…

MALICIOUS

PDF

81.0 KB Created: 2021-07-02 06:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bf066b9e9385c3437688f7ec53bef5fc SHA-1: 662d477eef427b44717bf542cb07cbcaafbe9ac2 SHA-256: 57e85fc28f8515809bd950f0f297fbf795b98d2c5050343306dc04e0f6d2c693
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to these sites for further exploitation or phishing. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ab8d146d---suwideporesagurafideto.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bibevubumoredenegofojej.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608318e1ac30c---50050366839.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dee41a43c---zoxujupumuxoseroras.pdfIn PDF document text
    • http://asustainable.com/global/file/zamamokavuzenaxedado.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c510e294d---9596224165.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/xabepetavekisi.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/42820025898.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/vufizerafarenuwawawituv.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pieh1pukjsgcppngjg4j8hdirl/20627443504.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/33148515577.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/pagovo.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abe2ab59f0b---93760151312.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6adc0161f88dccd8a94009388827bcd2/79697072439.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/6fcb29f15d90e70cdd684981191d521c/70913171773.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/saseputukuzilojozivapet.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5pqaftd49aks0elp184gps3ss3/17814665625.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/66479141381.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1a9e271c3e0cf807429b1ead8d79fbdf/98235529261.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/2gr8d2absff6bk8a17fcha6maa/zupozavagena.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ba0568c06cc8af576a92dea66734f748/56484867554.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505184600606442.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/441d34bd6de687b26fd0ab0ee80fa663/rarusojutu.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/simewavupidikesawof.pdfIn PDF document text
    • https://mattress-leader.com/media/74281486481.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/gekezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ode+on+a+distant+prospect+of+eton+college+themePDF 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_off0000cf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 20480 bytes
SHA-256: e51d235c3fc4afb7a6ab626b6e10d80ebbea123a524ca07d4affc37ef992b15d
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 11092 bytes
SHA-256: 92a9beb41834bbf0cd9312ee27a19a5e02d22869024bfa231ba285510568b76d

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