Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d5c58536c387ef…

MALICIOUS

PDF

91.5 KB Created: 2021-08-25 02:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14c5f80470148a0c3684a5311e991edd SHA-1: 9265b5dd2c680c904c87e44f3c3ba1dbb75d8091 SHA-256: 93d5c58536c387ef345eb0203c63c8b41a2d9c2d262406bc1d08c37ce46f7dcb
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated high maliciousness. Heuristics identified it as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The embedded URLs likely serve as lures to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/13276545469.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d304cf0916---fakupubexijowo.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/12887356036.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bd67ae2a---84440851817.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/13838909073.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/32353903430.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/tavozusigigepu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/69186155677.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1cf8a528e424a34f5957530a268c9c0b/6935029478.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/58890765471.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8d3af9bedceb095023ad2d4c7763c4e1/lewakefiletifubivap.pdfIn PDF document text
    • http://chinalabware.net/d/files/bukanuxato.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/58341074212.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/sesukatama.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/19717339090.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a0bbd55d2---siwewed.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/bc5f1e78d0fa3e50b8a2e1839629d788/83891085934.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/vawixumewepuma.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/11484210138.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210602_DEAFF4F95DCC9E9A.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/25100578911.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/29a9fc1fe420475e96d4c1a215237c5c/66797246403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=where+should+we+go+this+weekendPDF 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_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 17796 bytes
SHA-256: bd0a7878aaecaf6fd6490ffc85488bad14ead5944c055b84e3bb9f5cfded5abb
font_01_sfnt_off00012fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CF 10636 bytes
SHA-256: dbb708b5f19667f72a3930998032aac8bb20b90dafb3e8abc6ed30da0eb4d882

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