Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4370fe093179e90…

MALICIOUS

PDF

74.9 KB Created: 2021-07-03 18:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70f538610062414cc20527e621910422 SHA-1: 14ad0b9e3d11562705335aab1b3e6f19e901842f SHA-256: a4370fe093179e90c71fafcd7b74ae59fdbbe1a9b479afb93768448db99a8896
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS installations, specifically using the FormCraft plugin for file uploads. This behavior is indicative of a link farm designed to redirect users to malicious content, likely phishing pages or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbaa48640---86401170713.pdf
    • http://seabeachthailand.com/UserFiles/file/loruxozobitobif.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160744330f1728---99379136773.pdf
    • https://accuratesearch.com/userfiles/file/36057164392.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/77c879e107c17433f16fcb34a66116ca/natubopu.pdf
    • https://alice-immo.com/userfiles/file/34064245050.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085be28f1ce7---faberegijiwupokon.pdf
    • http://sanruou.com/app/webroot/uploads/files/wurezibesojoneneru.pdf
    • https://landbar.com/upload/files/96712295391.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e195ebe30f483fbd3ca95935f6a51aa9/mowazilenale.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/b0453584bff688978efc2270fa45c997/zubaxisosak.pdf
    • http://jshtextile.com/UserFiles/file///89076079859.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077c10967dc9---pazugamejipire.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/b848f0244e0864f2f6c8393cf1bd6f95/vepibuvikigovusalus.pdf
    • http://caigeshi.com/uploadfile/file/2021060117174273499.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/rv3c0pgdes2rogsr01c7mrn314/35178756389.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/m05df61l3ccje5j345ni84jl1h/12689121609.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-10/20210610130140113097.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6ks7iuumfojsm9629gcg46do04/99248074358.pdf
    • http://fongyoskert.hu/userfiles/files/44416985883.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3344208845---64968845440.pdf
    • http://isvpro.com/custom/files/kolozi.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd04be065---17513516625.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fa1667c12bbc13ae6863a5792c667756/52253505730.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/d7u3dhf5v350qcvj8u6frq395j/duxujumujoripajowanerafal.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/xowikexozilufofixeji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=1+hkd+to+rmb
    • 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_off0000c3bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BF 16792 bytes
font_01_sfnt_off0000dbd1.bin
a736e3b48489381e8766a0dab829c559e27b5c5488277d4bff780194006634b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD1 17004 bytes
font_02_sfnt_off00010872.bin
7b3b19877fec10ff64f0b83aaaee921c4083d731251d675ae9ca554d44539f1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 9996 bytes