Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd6d992eecc65a0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 19:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50247c672e182ebeebf02480c151114c SHA-1: 5b2b574e5e4c1d291c71c376555ea4ba9c246ebe SHA-256: 2fd6d992eecc65a0f7935db854c97976d6ce41e12a255d66bb52ab53d92e6bed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=android+auto+off PDF link annotation
    • http://chinazzjx.com/d/files/81004426827.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/33529533626.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/keregunoba.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394a9061fca---buxidojamugelebasim.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/xoxuse.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/lamenejegunuvosafaguka.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c727bb458690d0e6b033377c6079470f/29210822232.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/wibuxizedasaw.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/rukiledeganezexinoruzejex.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/39340445416.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/84022002653.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/posiduzivikigovu.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/97426805945.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/57380476354.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/rutusa.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/xifimosepivatadizaziniw.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/5193846756.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rnc2e1v0gng2bu2q5lop141sbs/xazijefawofokugi.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/jetusojopajowe.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/436366778.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/48228945537.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/zobije.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/895eceacc85d947b215b3d5dd86997e3/8225267861.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/21584554636.pdfIn PDF document text
    • 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_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 10084 bytes
SHA-256: cc22aadc81691d26be756932b7451809a6a422d1517ee9d0e6df1f51e7b2ed3f
font_02_sfnt_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 18160 bytes
SHA-256: 1c62a0dc9a4e0c55bff352e392948487a429c2144e53f6c6681afa31fa2f9174

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