Malicious PDF — malware analysis report

Static analysis result for SHA-256 38393b7f8be84a50…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 10:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab392471c1e037616b0dba7c396b8419 SHA-1: 8c0e0838dec86e0794b0702656288a3de34e5b6a SHA-256: 38393b7f8be84a502bb150a61f2391a48ac5171e2a060d846af303bb528026d3
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a browser extension installation lure. The embedded URLs, particularly the one pointing to a compromised WordPress upload, suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly imply an attempt to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaff060095---47224414252.pdf In PDF document text
    • http://hsound.ro/images/custom/file/xufuwaxikun.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/nesizegitap.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/21557483856.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210706215508_250142.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kidufuwukibuj.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210516182913.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/80526793758.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/m2goldrraj9qotemvk2k48a2ju/30790844362.pdfIn PDF document text
    • https://beaszemin.com/files/gulukadaxepewesisajatirar.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0c701314---temenisosavetakuzabukulog.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b9d172a8717fcd2df2a247e6e01af0c9/52019158876.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/93230856279.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/mepodetojituwed.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/dilabuxufuzivasepem.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/59c7152ca2895a064325186168efe038/54296242448.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/90940101203.pdfIn PDF document text
    • https://samowar.me/upload/file/najetaxoje.pdfIn PDF document text
    • https://signika.pl/Upload/file/16793768717.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109010434445424.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/zedanawekaxujon.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tesasazulizilepum.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/botumo.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/04bd10e3610f1d26c81921f0e708102f/40756154827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=comment+couper+un+pdf+en+plusieurs+partiesPDF 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_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 10912 bytes
SHA-256: b0f5283db7d7f6d95280d7c6a1ebbbcafb039aed58e75b9131abcd84d941ef14
font_02_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 19088 bytes
SHA-256: 1721d03eb317761b95536662ab63819ab28c025f9bde03c0a3202f80c26fb84e

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