Malicious PDF — malware analysis report

Static analysis result for SHA-256 750c9c96470d70bd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 03:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94f35ac9c6862c7b8e6a4679b9ec27fe SHA-1: 2fdb376ee7443f4718a2b75b759b2aa51e4ae83b SHA-256: 750c9c96470d70bdfb58ebbf631baf1792aa3b92ca2a8c43ec4e8f32183556c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards a potential initial access vector via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://konteshamamotu.com/userfiles/file/21750108838.pdf In PDF document text
    • http://www.lalorraineperdue.com/documents/76532072837.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/reminezutuxizinuvaka.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/42121c9ad98195ccfdea11f6a6937bfb/49582174886.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/kapixaketo.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/1584385678.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/50df9aae8ccafecf80600b424b428289/gutowebabufotorax.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/jejodap.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/41035544521.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/fiwamas.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pewexedufowazi.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84337082527.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/loxid.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/21488165437.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc46eb1385---14670937087.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/rexirinesikidojos.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/metuzuvodi.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/dafilusesagefibawijirowux.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/deduzaf.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/67890188074.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/witupox.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/xawupelaxigabisa.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/47113355440.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/womajepabejufu.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/66196637151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=windows+home+basic+32+bitsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 17012 bytes
SHA-256: 17fc06c40616ad75a0cc54d6070f186a82497ba225d00698ca3ea9edb0d70b8f
font_01_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 11000 bytes
SHA-256: 23fb13b77835c4bff9fc9d7f13282c55e4e69fdb17ead26662e341700e6395d0
font_02_sfnt_off000121fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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