Malicious PDF — malware analysis report

Static analysis result for SHA-256 055247f9bcb643ee…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 19:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d15f087772090c8ad4438b8bab6fd0f SHA-1: 1625e3320b661d37cea9409edf377e397e89d2df SHA-256: 055247f9bcb643ee0a988448c3780cb5cac4699c661e54f4e278f1739cb425a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be redirecting users through these links, likely as part of a phishing or credential harvesting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://iqmuseum.mn/uploads/files/17746156178.pdf In PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/28311780199.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161373c088b142---94929701374.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/fiwuzom.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630797832.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355ff4d7e1e---91385603122.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/91857005091.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/zefejukilen.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/zonodutezuxojafesogiselu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210908183615308.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/venomulamukurutuvimo.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/99434707836.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ace444d51---muwumedaridiruzemosu.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/fabifi.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/wojoxoli.pdfIn PDF document text
    • http://ccadl.com/files/20210909095047.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/xalazosoxik.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/porupogukufexujovaf.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/patoxaj.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/safedewazuvigozizowarig.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/gusidafuvozoze.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/20213781163.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/59992782878.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/tosedubij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=family+feud+canada+auditionsPDF 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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 18216 bytes
SHA-256: f9504a7bc06abb1c8408dc2be8c2c591cba96faf8ae9f470231b417ebc5cd114
font_02_sfnt_off000120a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 10728 bytes
SHA-256: a259ddd2d7f8a06678bfe61e2b45d4a123b1834e1a8c9d7d8fb26b1d5ba6845f

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