Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b9b34c2bc4038d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 12:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c41c3d288130117cbc7da80517d9c279 SHA-1: f89e0faf1a760781987bc153f1d75efa0f28bad2 SHA-256: 76b9b34c2bc4038d706766d008ce24864e4c18ef353f26a1121dabd336f4bd9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14c2ef613---videsiwirajitemexolug.pdf In PDF document text
    • http://tnhmc.com/userfiles/file/75104796920.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/muropifusas.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e58f02d56d---vekoberutileb.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c28eae565---65475493530.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/fewobosonutupizoso.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/natedanoma.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/91380954622.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/porikazomuwuzegaf.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/bokutajefuteter.pdfIn PDF document text
    • http://maidichike.com/upload/files/86836011036.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/balemuxaxibopa.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/ramidufezipipo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c88c0a4fa1fd0dd00738ecae1b010b63/leletoroliv.pdfIn PDF document text
    • http://video-cycling.de/files/file/pifixegulubu.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/4376237287.pdfIn PDF document text
    • http://partnercable.com/files/21062820536.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb22b0403b---38529999592.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ad5a431e---nusinebikotoxad.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/14570391097.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/zosedaweg.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/43244503226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hyperbole+meaning+tagalogPDF 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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 17848 bytes
SHA-256: 23b4e7bb82c6f8586495417ce6afee4c67db172b02909d248a7f02a3d77fe627
font_02_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 10672 bytes
SHA-256: 75d9f7b70b130fc9e3a87af73591d3125ffe474300a4021a704f6b0db97522f9