Malicious PDF — malware analysis report

Static analysis result for SHA-256 8166187f73c6aa3a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 14:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9c7ac452090b5b4e3aab74d3cf635ad SHA-1: 545ac78a02cad564af30c22ad7cd50428bfecb33 SHA-256: 8166187f73c6aa3ad28e02fe3aae4fc0c639581828526f7294336ce18cb4e5dd
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and unreadable, suggesting it serves primarily as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138741c25eee---4847027094.pdf In PDF document text
    • http://canoeing.by/pics/files/votumoxomobawogeleximiv.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3d4ba8de35ff55f9cb9cb62d6b2d16ce/tudofukedukeku.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/96870156861.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/fimipumibufagi.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/77345516991.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/18979004495.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/bajabotimezages.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f96081a65b---xujapof.pdfIn PDF document text
    • https://blv.by/upload/editor/files/61273120617.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/75236897942.pdfIn PDF document text
    • https://costarica4d.com/contents/files/zaritokukabuxelesojef.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/bopokitigibesene.pdfIn PDF document text
    • http://svx.su/ffile/file/58785022997.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/runiforitakikajujoz.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/fegax.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60055146750.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/40211941621.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210911_7D075DA4D9877569.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/fukodaseguji.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d88407c8ae---nazota.pdfIn PDF document text
    • http://one9five.com/userfiles/files/romusonunexotidifesolovej.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/49023714864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=traffic+rider+hack+version+game+downloadPDF 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_off0000bbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 16148 bytes
SHA-256: 4d131f76697cfa7898938000307586e8de0dc4c2dca0f50d327a77412a437bc5
font_02_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 11032 bytes
SHA-256: fc4f6de6753a46f475315a38bf4decadf0da42aa5bc90f33fb16e24dd6a58604

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