Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb4fddcaa7ce60f…

MALICIOUS

PDF

86.7 KB Created: 2021-08-19 06:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d02e6e9a2b4eeff7b73a61f74f9e3bc SHA-1: 27249b575aa18ac6b91ac941103de89684dcf90d SHA-256: feb4fddcaa7ce60fb489ce19ac36ec2d371ae45ea73c178bd4de85aedb0d742c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4658a4d0---wudulono.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161110a95414ec---20887197372.pdf
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/10371109346.pdf
    • http://cdhsalumni.com/clients/28864/File/nuparanakadixisezagakux.pdf
    • https://datajournonepal.org/files/nalotuwunurirorizoreje.pdf
    • https://www.gico.ge/ckfinder/userfiles/files/vunixadebarelazin.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081912aaec91---kanibebubavonisit.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gcubldl61haddspuodhe5f4te5/zawikogezituzopili.pdf
    • http://netinflux.net/userfiles/file/78743709321.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2b6f1630af2036e84d0a9bc92424a87a/gaxidakususofatedur.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c71069b550---jawaxupo.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea9ad7056---64520631845.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b15c9e38---bobovewudosipasuseguze.pdf
    • http://bighost.vn/uploads/userfiles/file/zofuzaloduguxaxexi.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/448r82qq7slan2d7k96khd1tdi/35517470133.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105cdffdcb56---33523190362.pdf
    • http://anhopphat.com/uploads/files/poriwiluzopeke.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16109a845eea4a---makowevigefajedufuk.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/b2c95719d498d117ae9758435efcfa3b/28212693266.pdf
    • http://kavtas.com/images_upload/files/kuduzozizevasu.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de45b183cc6---77657903368.pdf
    • http://thankschicken.com/uploads/files/pilatupalivanibunu.pdf
    • http://lesmashclub.com/imgUpload/files/86035375471.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/42f0d3ae3ae4b34bbb38fe372c6c39cc/jedemukelebatiriziti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=inscribed+angles+worksheet+pdf+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2f.bin
2cafffa475359210adb41d3c3e3c088a1ac141f0afa4d888afb15d25f750c8a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 17388 bytes
font_01_sfnt_off00011ada.bin
2f0108c078c8005b3ac61550ef3e0ede1592969c07c4c999b075f9e9229df6b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADA 11168 bytes
font_02_sfnt_off00013488.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 16792 bytes