Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f1d28ffb4b13b8…

MALICIOUS

PDF

77.4 KB Created: 2021-07-21 20:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a7d277674bacf6c6a38542999fc3c3b SHA-1: bc873d785980817666bd8902d9438631ee5526c3 SHA-256: 01f1d28ffb4b13b8a160e571a04392b9bd0fd46404a27ef9e3a14e3d28951b6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of an embedded JavaScript stream suggests potential for malicious code execution, likely to facilitate the redirection or download of further payloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fobosgrunt.ru/files/ckfinder/files/1228340437.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/sulizonajo.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4fca66d5e---detenadozoxukotugixo.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d181f4909f6198aaaadd7acc0139ec0b/waxabizikutedudarud.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/99573179133.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/340a945f15d9eb7d965a1b9d79f020a4/lebelozokonoj.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160733220df687---memasiwavabezigasok.pdf
    • http://malagi.pl/user-files/fck/file/raneda.pdf
    • http://btc-ltd.com/upload/file/pufinavefidurawagojato.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/29dcfe2f764a24c4ba363ce9a540fd6e/15644831738.pdf
    • http://acecaalcoy.com/userfiles/file/vopomutoniragerijone.pdf
    • https://mauspro.net/upload/files/budogagofowatixigoseg.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c9b4b3b710a41e7387005843459b70cd/67880590976.pdf
    • http://kapelski.pl/userfiles/file/tejemujowekidavivodile.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210627074926.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/lisuluk.pdf
    • http://www.hgbehringer.de/img/files/files/tutopopefafuvukufo.pdf
    • http://karate-talence.com/newsite/userfiles/files/56978046655.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1b2b73826332de0fa16fced7f04078eb/65128345073.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2b73efa6a---pinapez.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/91471514985.pdf
    • http://files.ibiza-ferien.de/file/14278678502.pdf
    • http://banphimchuot.com/userfiles/file/vexixev.pdf
    • http://simonide.org/userfiles/file/gasosexonubaku.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080995062533---14343763395.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/8cgaptdeakru8158fsgktr2ko0/voxigurowiwolitigin.pdf
    • http://tuttotop.com/userfiles/files/14780617219.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=despicable+me+1+in+tamil
    • 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_off0000ca4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 16792 bytes
font_01_sfnt_off0000e260.bin
8f8a3bdcd123cdc4e02e2147cfffd83024d7944dcd7b6fc506365855beaf5c95
pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 18000 bytes
font_02_sfnt_off00010fab.bin
e298d88632942170a81bba8b6149e767e5ede92bc66c3b18ae280be50e0bf7d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10508 bytes