Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7290a98c06876cb…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 16:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 399bc34b070a6d85cce6f4dd026b78f8 SHA-1: 07bb99a014e3406e101f5209a0bfa50150d77fab SHA-256: b7290a98c06876cb6a6c1f8731c9225855cee35e23011b0a82e83da9b6bf5c24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

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://pistant.ru/uplcv?utm_term=goodman+heat+pump+user+manual PDF link annotation
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071712c60eef---45293626679.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/88852267275.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/18534696997.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607f007bf12bf---zobinu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/34373210223.pdfIn PDF document text
    • http://scantech3d.com/files/53302706951.pdfIn PDF document text
    • http://hongdacable.com/d/files/78682136997.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/pexuwikidejivutox.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68a923e0c0---45116091038.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/fozanijebokulojigajuda.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f2785d08a---somud.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/wederekuzevuxukigijime.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c1bb08087---62254147872.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/19542969625.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af199e80d00---70648175481.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0jn4s744c4scd2fij90v4lt4g2/kipixerusirupadoro.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cb123a4fe575dfd2ded25f3a24eaab32/51489729373.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130b032e99aa---risufulonavilufopexip.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7e820300a69dd640b28e68025a76e7e8/84241933994.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feb2f4cdcc---bivoxanorojarafa.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b910ae68d---89136390304.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050407341270.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://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_off0000d066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD066 10704 bytes
SHA-256: 4afe0994039a5c5b3a0bd7e0026a0d2e293ad93cd68bfb2afaea30da17e75f4e
font_01_sfnt_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 17148 bytes
SHA-256: 29c555b6a23b8d7f90bd62499207c9ef2ed2e746f0a6e08984778a8ab8dba973
font_02_sfnt_off00011518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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