Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bb468272b02838…

MALICIOUS

PDF

88.9 KB Created: 2021-07-31 06:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bc6991664aba58dd7e2184e68c161730 SHA-1: 735e1c0fca233eb04368de0081c242333123eb9f SHA-256: c9bb468272b02838d0d68912d7c61adf7724073a2a0e5bb79a1cac697d308bf8
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. The document employs social engineering tactics, specifically a lure to install a browser extension or update, and also presents a callback phishing lure. While no scripts were directly extracted, the embedded URLs suggest a link farm hosted on potentially compromised or disposable domains, likely serving as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/59570823019.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ff084f1a65300e5c21d033fc5708231f/xesozuxenobagunozubirodu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc408dee4d7---lejupopidutizuligifom.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/56878564310.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/tusunonobozikite.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/iu0m7o07g33ludt57qrdnmvcs5/53363219792.pdfIn PDF document text
    • http://charivne.info/images/file/53649371931.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/28722274087.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/tapowugofafiwub.pdfIn PDF document text
    • https://congchung7.com/upload/file/pozunojiwejefugikidu.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/jusoserumafeguj.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8462c66f8e78a169fa2e776e7f774f9f/pogavakovebogub.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7847a84a3c---3209199391.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xotitonozepofikomi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7802b4a2b970a726c6dc28f720d991f8/gelalilixetidezoser.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/5977357770.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/putuke.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5c7bdc98881ca9d4f529b8a525017c77/56940656920.pdfIn PDF document text
    • https://windsbs.biz/files/file/28080649721.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/pixabijigavina.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a85d2c84---31272190419.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085576731496---wesixazawazasalogu.pdfIn PDF document text
    • http://minerva-collection.net/files/files/2042654276.pdfIn PDF document text
    • http://shesob.com/file/files/18930163554.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/37869324172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=common+noun+and+proper+noun+sentences+for+class+1PDF 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_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 10872 bytes
SHA-256: bf96858b689ae957da426e3831116bc89416be139082df7659bba0a5aa7c4c20
font_01_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 17368 bytes
SHA-256: 7b2ae784948a966d67a2769086a1b9791748e6086e1ddc35e30901a0766d9d11
font_02_sfnt_off00013a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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