Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10ee3cc25099313…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 10:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 392aef249485c63a9e4e62b5ff09149b SHA-1: e03e00e72f60cedc41906e4d4c3b220dd4c1a355 SHA-256: c10ee3cc25099313a84f707f112d76abce4c0ff8feced8c38acd8d1c8f7afed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, including WordPress upload storage, suggesting a phishing or malware distribution scheme. The PDF's structure and link farm characteristics indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=standard+deviation+formula+graph PDF link annotation
    • http://cosonhuath.com/hinhanh_fckeditor/file/13129172244.pdfIn PDF document text
    • http://endobible.com/userfiles/file/45146242428.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/pesaso.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135658786922---bavasubifiw.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/gisovetibofuvife.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/28845389947.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/moxebavena.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/suwidigowuwozagunomofej.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/pexewiz.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/ritojolutu.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/19691555085.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132370a39169---58743945989.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/ralelev.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fe85b9c9---15583192267.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qemett7bjpb1ciklakv7m5ids4/xebubodiwexu.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/4810579529.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-18/20210918154903741164.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210902054507.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/2159066708.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/vituzasularokopif.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3f40204e261455095fdabc480c291a8d/bikirofafovuvatilil.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa7523085---gufesetipisojokejinozoji.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc0f5492a6---kokonelixepururizuno.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/86684237787.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/kejom.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_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 19008 bytes
SHA-256: 8d0b5f5f1d9f629d858578b3fdd2919b75d9651001b04d41ec35726e3e5bdf39
font_01_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 11016 bytes
SHA-256: 87e95fa823ff6ef6dc28d45e9daaca937d1f1b2161f60797e75f3919e67097a4

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