Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f42ab0f5392626…

MALICIOUS

PDF

69.9 KB Created: 2021-09-02 04:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18fcfd9d7ba63c7d5a750b9fa3cbc292 SHA-1: daf0d3f2b8d1f535f64d574068a42619f673dd26 SHA-256: f3f42ab0f5392626ab37fcc0d0933626bb5de323dd279db06c20c170f4858e7d
216 Risk Score

Malware Insights

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

This PDF utilizes a screenshot lure, presenting itself as an image to trick users into clicking a link. The link directs to a compromised WordPress site, which in turn hosts another malicious PDF. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=another+word+for+devil PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/uqsa053p6279uj8d6sml80g2d0/begepilelapusu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075133fc6f18---gapalip.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082403417d78---perawidikojodov.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/tiluvexusevi.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/5qq9agaeuv3pk9tge9f9glsp3e/fonanizivobizesodit.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021070610035673499.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/benamokowavifefi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f2377b68---fidekumonozefenodal.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7b34b530d30247395695edd5f02cd56f/73369546207.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/pisizomuzux.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/wezetotevadeniluko.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e590d498b0---tizutetugotuzagedeniv.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a45ccc9761---xejoratodofip.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/she6e330fts862cormi3npk472/12433401854.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1i7u6q5ahuo2eddtkb4sjq1ek6/22099775619.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/nisikagafazodakata.pdfIn PDF document text
    • https://network-italia.com/file/31040850745.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16209658995244.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7eddc914e3b6668167bb8400f877a463/saradiresuxobapifozo.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/radavataf.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/zatujazidavitig.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6281ad1e8---wobegekevodir.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_off0000b757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB757 10252 bytes
SHA-256: 3f380fa51be35643688a592c0f96e228b5ea556dc2c9c2771fb157484efd000e
font_01_sfnt_off0000ce59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 14124 bytes
SHA-256: d20ba708622f34db852c3b72450feedabf64e0e4225bcb4249ec6335779dbfba

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