Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afd0b959eb31e4a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 13:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a3ec06a12d4ef3e7af3438338d108aa SHA-1: 9709b45babaf019b8e87f287b6995be7c70aa5ea SHA-256: 6afd0b959eb31e4a04c430794ab25a77c00d1efde1f3f7c97a70c838419ac5b4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lifesmart.ro/ckfinder/userfiles/files/gobuve.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/93ddc9c38273b324dddce03e37fd0fa9/zulekefak.pdf
    • http://fitviewer.info/files/file/73845050477.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613301a731127---91759778369.pdf
    • http://vasekurzy.cz/userfiles/file/67589076092.pdf
    • http://lenosada.sk/editor_uploads/files/tivibodekejarigaparu.pdf
    • http://d2dgroup.net/upload/files/runerixipukexotewajadorew.pdf
    • http://files.ibiza-ferien.de/file/37194682567.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3facdc55395bb5bfe5817b320d111a6e/tuzitumotabegivekage.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fca994b07---dafere.pdf
    • https://auto826.com/uploads/files/97501773129.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0b4da9b796a19e33f93635549c50cee2/redugemiw.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/wesobuleputemakas.pdf
    • http://pnlestari.com/visitbali/image/files/579594923.pdf
    • http://www.romanschatztruhe.de/img/files/gupemazepezisoziwibox.pdf
    • https://aventura-agence.lu/userfiles/files/bopujusadesasowa.pdf
    • https://serpavenger.com/ckfinder/userfiles/files/gozeruburesewobikosogivor.pdf
    • https://petala.gr/userfiles/file/72909194912.pdf
    • http://suurelepa.ee/data/file/veniwigupatomomovufekuzot.pdf
    • http://premo.at/userfiles/file/mibozatezubijodixoguxil.pdf
    • http://olynskiconstruction.com/pics/file/77013088644.pdf
    • http://bkdesign.ee/userfiles/file/31656148442.pdf
    • https://k31szmq42-nu28.com/contents/files/10831414402.pdf
    • https://inmaabiladi.com/userfiles/files/69402492603.pdf
    • http://romanasulcikova.cz/userfiles/fawabazaxikokovixaretufok.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/87396970638.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=laud+music+app
    • 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_off0000de2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 16792 bytes
font_01_sfnt_off0000f63e.bin
dccf47b79138c104f4a972fcd13a03467ca19f90ee85886efef893e9c41a8ea5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 16736 bytes
font_02_sfnt_off000121ed.bin
36bd4e4dccd1d0dceee9d1c0fc0f32cd1ffd5287a953bb0a7a8afeec48fc73b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 10132 bytes