Malicious PDF — malware analysis report

Static analysis result for SHA-256 d132cf6b6d738407…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 04:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cbbc158cfec430ed24c982e21c19a28d SHA-1: 799b9972b88f7df849b9b3c784feeddd4dd39889 SHA-256: d132cf6b6d7384072f4a41f54424e99a8e88e526f56a090011beeb44bdd5aa04
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the lure.

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://crysiq.ru/uplcv?utm_term=my+lotto+app+android PDF link annotation
    • http://musicpark-live.de/userfiles/file/vabetadesesototago.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/55135059162.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/1167205209.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/38f75ba57eaca7659cfe9fd117d5719e/38312775042.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/99919857299.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/10127948672.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/17115551964.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/kivawesefulofe.pdfIn PDF document text
    • https://diphong.com/uploads/94441154315.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/12749354234.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/23620220870.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210905_F6A918417F213DB6.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210919_881E05CC46F6146F.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/maponi.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/muvogopinitevezuzoxivug.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/40598079774.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b4291200d---79591353433.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/bokexoga.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/69052873491.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jebixaf.pdfIn PDF document text
    • http://didula.ru/img/file/16115815347.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/66189207488.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/xagugatulixizigagumanek.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/120271ceabeb9c5ed938257b3d2a479d/dajuvunuvuba.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/vepagapabapugegapa.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_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 10192 bytes
SHA-256: f8a755d700f66e9e57ed71e3cc41f75e0480cb4b30ec6879fc4bd908c89fe50a
font_01_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 18476 bytes
SHA-256: 8a95ef59c73324fca3dc2a7ce5859f8e1f4f9613d2d7747f3d805a10c008694a
font_02_sfnt_off00013106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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