Malicious PDF — malware analysis report

Static analysis result for SHA-256 90459344187be041…

MALICIOUS

PDF

109.7 KB Created: 2021-08-05 05:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c803fd05df341fdd65aab14ca0e8a8f0 SHA-1: 83e015fab8584e2edf001a032ad1058ddd7bfda4 SHA-256: 90459344187be0418aa83df209689d70436786475779a3cd7d1e028f93ad1dea
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and link farm characteristics align with common phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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 http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160807d3a8fab0---tufonozufogeluje.pdf In PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/v0sf0ki180dpust5en5d6pds8l/28643773136.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/55773057349.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a750b1dd16b---devutixupofux.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/43884600231.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160814e792b38f---sifasujenopubupimoj.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/44732efc2f82c44b63a103d4d18d18ae/68831223610.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/013961bfbd5a95190b9279040fcd9302/68463734377.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83ff85221---13373100821.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/xixudusinovusuxaz.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/r14496q7k4rrddgj6kd68k1doo/52093175094.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/zoxulovopelobu.pdfIn PDF document text
    • http://airfa.it/userfiles/file/63738080006.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/koxiwow.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/kukonejitezibojatagax.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd4201d43f---lifopetisagugibabusikifud.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a356054b955---jikaradiwega.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/sabozufodekezotere.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a8f0b2c6---51275401299.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/bufuxasajojuloz.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/72375644021.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/xewofakakanagifezafa.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210704_28784E6D9C1E9B8A.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/suzibibapekatagefe.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3655b3e7c2---33931551440.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1bfcace2c490b8293955f3222e02e251/82326711362.pdfIn PDF document text
    • https://scalper.ir/data/files/file/49826588191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=stokke+harness+4+point+manualPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 18392 bytes
SHA-256: d2e95afd4d31a4cf4c8027e6c02925aa3da1f808d5ebf459e281e7cfabe7f38d
font_01_sfnt_off00012e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9C 10864 bytes
SHA-256: 1719826efa90a778ef0fb16696b48ca4ede6a8da093278f20c60e46d828d59ed
font_02_sfnt_off0001478b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9D 23532 bytes
SHA-256: eb36c84ef06f316bb85ec669f8bf6de51e46386f5b641fae1d72120f6cf271b2
font_04_sfnt_off00019942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19942 3196 bytes
SHA-256: 5cbf8f09f4f8f331607e1ab79a60a94876499fe2b35c15e056bd23ddee5904c4