Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32395160dc78a38…

MALICIOUS

PDF

72.7 KB Created: 2021-05-31 04:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4f6b1da44ad3c34ae59fb0bb33a4a4 SHA-1: c3cf5efe4d45deb8ac1dfb7eb718d2cc3d5a945f SHA-256: a32395160dc78a38531bdc02301c8195526f59bb72c6f5ab9720f6bc74ee1bd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/126103bfbb6dcbe7b646fcf9ab3bed7b/feponamemewivifuzafabe.pdf
    • http://ipceurope.eu/assets/file/rupexifanotu.pdf
    • http://geoplan.su/userfiles/file/96043805568.pdf
    • http://poorclarescork.ie/images/59572925783.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923fe8eb096---wevesikamugazalulusaboku.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/340a3447215c21909ca1d611bbbfd7c4/36787915648.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d59a463d9---jagopa.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fa38d645f---9051046823.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc2cbb056d---soperesivavuvixepimoxizag.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160779c637fc68---70121952702.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4b7e2a0b08f8453d4297733537e4aae3/71023267234.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/92109e8a6758156bba5d354c565f381c/75536826794.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f4ae3f93ab04c1e411109641be21d946/88422624811.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/667842013b8317f239464e36dbeb9ce6/wenazokekevetanumegedut.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0u1m836kt61ka5brjvitutlrqg/vonirosofafuvu.pdf
    • http://buergerforum-tirol.at/file/81445987780.pdf
    • http://amdind.com/userfiles/file/sutularelaxibunanok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=five+nights+at+freddy%2527s+3+full+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elem
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e112.bin
d3f33b0c4a22f4904ed34000ba2a2f1df32ed741376b8c047d5e30e362e390a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 5772 bytes
font_01_sfnt_off0000f4e8.bin
da4cd7db0cedb6ea6b6e00ab949b7e25a5479be4215065ed171c8a1d36d56b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 10720 bytes

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