Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42eae9375351022…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 09:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64d7fe6902e7f05a3287f9316e59e182 SHA-1: 50aa39b647c4eefb6f1f59a5f6dc7859dd663b43 SHA-256: c42eae937535102261feb38df4c0d05341f74e67cc2179a00eafa76f86cfbebe
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains flagged as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://mebel-moscow.com/content/xuploadimages/file/gewimebav.pdf
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/kanufe.pdf
    • http://ipceurope.com/assets/file/11312697484.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/48bad8048f12a69fb46df8537407dcdb/81906537810.pdf
    • http://www.kymenhome-etsinta.net/tiedostot/files/4582388981.pdf
    • http://savytrading.com/userfiles/file/63383535128.pdf
    • http://kientrucsangtrong.com/plus/files/pepukuwiwizanodusewo.pdf
    • http://avanti.pl/userfiles/file/donagi.pdf
    • http://generaltubi.com/container/ckfiles/files/fasajur.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/lowiwoxururupi.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/rphdsebp745s83nq2achir920e/xulidinulixenixumepudur.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/lotofutedipufoxepagudi.pdf
    • https://rwd.webseo.tw/upload/files/jexexanid.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/kqukcjj41mg0ck90p0sq4k00a0/gixavijuji.pdf
    • http://autoscuolavalerio.it/userfiles/files/sejixefasi.pdf
    • http://nineslash.com/user_file/file/kisogugam.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/mevedesal.pdf
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/xozapateganoni.pdf
    • http://air-con.ru/upload/files/44431723628.pdf
    • https://producedepot.us/userfiles/files/22667448770.pdf
    • http://kraemer-duennebacke.de/files/file/fugedirexetu.pdf
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/42339207827.pdf
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/nakegoregenafanumax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=llb+1st+year+notes+in+marathi
    • 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_off0000cdd5.bin
77ec948fa78a1ac2bf0a7eff4dff74c3cdfd879291529622fc7fd335962064af
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 10636 bytes
font_01_sfnt_off0000e60c.bin
f7c7af195b4a88beacd6707eda05a76af800620ad8ecd91444e2cc9ba81967cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 20324 bytes
font_02_sfnt_off00011bd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes