Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3269ed3fa3337dd…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 02:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5c10fb364c08303699c3a063ad13d6f SHA-1: a76549daae3f36fed41c13acf9956ba7181e3bc3 SHA-256: f3269ed3fa3337dd908cab9aa0ff9528715da01476c9206df676e2b8d4ec655f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to obscure the final destination, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.peritaonline.es/ckfinder/userfiles/files/2795016527.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/95084895993.pdf
    • http://www.electricman.in/demo/frontend/web/uploads/files/sorivojurorevopemegale.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/29858938280.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/22813403286.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe7d6c5fc---siraralizeg.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/73ee9ed07799513aa9ac55204ee06f26/rotubezululapirikopuza.pdf
    • https://primer-spb.ru/files/files/xajon.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/88954271907.pdf
    • https://mgc.to/sites/web/upload/files/divusenepoxonutilorugobam.pdf
    • https://capitalsyndic.com/userfiles/file/zamozajetibuvuta.pdf
    • http://arenabilardo.com/data/_files/kopasipixa.pdf
    • https://successalpha.team/upload/files/taronan.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/us4st9natvm37mlp3vpqrpco0a/remadebodikamex.pdf
    • https://impulsa.mantareys.net/uploads/plantillas/files/zutujelibot.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142cecd07941---fepusereweru.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/1769466214.pdf
    • http://kk-gorenjska.si/uporabnik/file/moweluduwapu.pdf
    • https://vanphongphampmc.com/upload/files/midasuripapapetabisom.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/patepobiteximonawagojapas.pdf
    • https://alley.52886.tw/uploads/files/64779323680.pdf
    • http://plafondchauffant.fr/img/user/file/nekokamopegasuwuxosogu.pdf
    • https://quangcaowebsite.xemlaco.com/uploads/files/vegosemavev.pdf
    • http://brmxn.com/userfiles/file/20210910124256_forge5.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=space+shooter+unlimited+money
    • 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_off0000e359.bin
2a09588022c5ba799da7fef032af0dc453ec7747656a23b675a5f86d3a23ee65
pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 11068 bytes
font_01_sfnt_off0000fcee.bin
a54cbca6b5ea82a3bc125ccdf03947c0e823ce57612b13665f2e58f1e2352a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 17168 bytes
font_02_sfnt_off000129a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 16792 bytes