Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d64069d5ac4f7f…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 09:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c78930a55580601e886e3a86202e1c59 SHA-1: 6ced70ac5d1d2d8b56bcea95733979fc2ddf8d9b SHA-256: 90d64069d5ac4f7fc7fd42bd1116099b17ac0ec07a3098dbeadf91c8abb5607d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f9c55c12c01d22094cdec7d222d02fc8/worevok.pdf In PDF document text
    • https://nabil-doukali.com/userfiles/file/71410544843.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/41012815447.pdfIn PDF document text
    • https://ksuskalology.com/images/file/49290045061.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210627_CD3CD595F64F78E8.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/44580356323.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210604_112752.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/j3l7pqngva1n855g5i1m538r3s/bedofexowuzajigidalur.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160da6d7f990dc---lozomesakegiju.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/69937490513.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/83904265978.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/19170952787.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/43019047586.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/93546672135.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1977166f5---miwuvivogopujatofe.pdfIn PDF document text
    • http://tayles.com/uploaded/wedibinelerelakilo.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/dotugifegix.pdfIn PDF document text
    • http://terrietanaka.com/library/files/tijegi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121cd3e8860d---3608085936.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f172a1800d---fadunebo.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/b4bc5fbe61bf466a9b8905331aa8f098/37460533871.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/64872661898.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/16829747511.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6be36dfc3---sexekatolorejuxukote.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67616affa32f3df94ecd6eb807c1e1b3/761203294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=congruence+modulo+problems+pdfPDF 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_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 10880 bytes
SHA-256: 250034ba76e50fdd7db9841d94ed27050e22707bc28fd8c226b7d301447f72fe
font_02_sfnt_off00011d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 18600 bytes
SHA-256: 75499ac74f68f382a0669c6a0b79357cf7f6a10614f67b962ad23cbfd01e221c

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