Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5e37abf34df4a3…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 21:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a3b58d3194b7b6eeb1a62e4b9b06f7ac SHA-1: 7ce261bc092f25391d68c45b2fa92a5d6ebf8297 SHA-256: 5a5e37abf34df4a3729aee96ce82179c27f970a4c03fba35752384138516f4a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://wastran.ru/uplcv?utm_term=melting+point+of+neon PDF link annotation
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6552661c3f249dea5ae2ee8827c264ba/71218092637.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965da6a0532---14844337977.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/jumurupibovurukofejusogu.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/nolejejeximuku.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/40147647293.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/12ca8dfcd2cd5810057029d088390f29/besiwaza.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/68b30712d2d49273dfe8038097e1dc69/37080825942.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b403suucgjvdh9ovv8k1ke1r1/95580762413.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/kemozoz.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7b5b08798---24093020695.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/51840092944.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7a5f9760949cd80c04a08fa449a2b645/basibezonademepov.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/wusigodoj.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/36850325767.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17bbdac056---dejebepinonisurilu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e504e547---minegedepopurotuzov.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/92320747600.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/50ba3d6d9a6f5f3fbf181b30876673d9/76373698398.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/32662348882.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/53dc2ab5f87f6a072d3ede58bf52a149/zunajowesateju.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/52643159162.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/susinimowu.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/47633222105.pdfIn PDF document text
    • 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_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 10096 bytes
SHA-256: cd3974d1b437a688911f5c14e2ebc5d01f1af0d2488e537138dacfbdbcc4af4b
font_02_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 17504 bytes
SHA-256: a60c5ba5def0c30966c44e91135fa3ed59024c0de942aefd2c75aae17a165266

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