Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72ea206dc95180e…

MALICIOUS

PDF

83.2 KB Created: 2021-08-14 20:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bf48a07ea24c379444f63ffba08a388 SHA-1: 89e881bfef567b0ad914b03ca9757c8de98b1aa2 SHA-256: c72ea206dc95180eab9ba65641d3b72653d98796bb5bf3ace083934a17d8200d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the PDF structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://linker.tw/files/zagebetex.pdf In PDF document text
    • http://matstravel.ru/userfiles/file/26678836772.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abf37b5f40d---3354475345.pdfIn PDF document text
    • https://eternalbliss.net/file/fapivejabida.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c9719c826---16273931622.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34060ac4f2---xesopobopazunepalax.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/rubibo.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/pasovewe.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/pevedamuwikoda.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/156829af593319d756538e2a0c014a09/pasupurano.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/39323565394.pdfIn PDF document text
    • http://heureka-cz.eu/files/bijulupuritokizinodakod.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/43052242647.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/29131838378.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/sedunibujuxoxogiga.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/zugevotaxepiso.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/68592891067.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/zemekaxivubirikawevitonun.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088701096cbf---19947544930.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/92708720345.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c83681c7b72c0c5f6a04018bc66319b8/19751277135.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/0037214f57e9128bb44134af0ca4f2e9/bapigona.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/25047062138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=quierete+mucho+maricon+gabriel+martinPDF 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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 18972 bytes
SHA-256: 027ce972ad97ec42c5f75736e3cab8bff74f4d666e42664a1f62c682c532a875
font_02_sfnt_off000123f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F8 10808 bytes
SHA-256: 5961a08810417c123a6e10861adff2f0b1da2deafa31000da0315f42c9835dc9

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