Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4adc08d19975a39…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 19:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fbc17c207095d64ab43971e9fb50427c SHA-1: 904402c252bdbd283831fad08db69cb6158e7610 SHA-256: f4adc08d19975a39ac1b2bbed5df20b8cb5bf6c590ba2d08642ab709426f5ddc
216 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of phishing and social engineering. It contains numerous links to potentially compromised or disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The heuristics indicate it lures users to install browser extensions or call fraudulent phone numbers, consistent with common scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://queure.ru/uplcv?utm_term=how+do+i+setup+email+on+my+motorola+phone PDF link annotation
    • http://dailymaydemtien.com/userfiles/files/92172639957.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/64773151011.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/18649682467.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/ledefodebefopawevi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66b118b5a---91878112496.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/duwilozirotuligiw.pdfIn PDF document text
    • http://lamay.de/userfiles/file/61258811988.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161320a171e447---94585485286.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/sojeli.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139445b835df---20322669770.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109020359463054.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ejalthcnjulpkc6dn14o6d5uv6/44394716348.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/xejigekozumegomepikubipo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613246186066f---mekopafomuveg.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/nekobudo.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/sosegorugup.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/pevunenupuzukolewij.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57255342660.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/42404791720.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/bonodozibibe.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/29433699375.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/152065173261397946cf453.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/pemutudevusenunimo.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/34578348928.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/kofus.pdfIn PDF document text
    • http://pk.mo/userfiles/file/73899729581.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_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 17636 bytes
SHA-256: ab3c69baf213cb7ce16e6500b04e7c76fffc782b1a8516ef55e309114fc533e9
font_01_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 10948 bytes
SHA-256: 72082d3490eabb165be26065d4223d7bad70804e7088652476a16cc65392c15e
font_02_sfnt_off00011cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1