Malicious PDF — malware analysis report

Static analysis result for SHA-256 539d06939707a532…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 16:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9fcae57b4766af80f4f374e063f8f81d SHA-1: 3427ce03341d9db0a4648393b424e20c49dd6bc8 SHA-256: 539d06939707a532c9503c57cb548ca22fd3980c08720e5a9316de0edce8fa8f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct users to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=a+case+study+in+carrying+capacity+worksheet+answers PDF link annotation
    • https://kaemsp.org/upload/editor/file/sufirixirozikinonid.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c29aa856a2---fizametujazekavokuridurar.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/86221103626.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/93590029940.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2837b2c53---69837634082.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/69944818211.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/48259888427.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dsks73tncsldrt3o0kue44uefm/80920271805.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/konudaxusovawewosepima.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bekiladalifikazux.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/80067099730.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/43578610692.pdfIn PDF document text
    • https://jagominum.com/contents//files/65888248574.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bef7cdd1---pijufilose.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/mb9aq0h6b0drl132h1ev89r1fs/jiwexomaxurawagigob.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8d8b9427---wevetajokomubupe.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/83655211957.pdfIn PDF document text
    • http://93564497.com/userfiles/nogufoxowonotuvozob.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/60023331389.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088735b3b597---44817799527.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/031a6074d3de18eed0a01a9570a9c42a/72131147304.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/35030875088.pdfIn PDF document text
    • http://renovator.cz/files/file/lejidejagi.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/zetawevalejigivubinok.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_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 17528 bytes
SHA-256: 6e66ce66f4df9a50b9ecf44028c5720a41332d0518c3d2e1cf0c1cc57feb300a
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 11120 bytes
SHA-256: ecc9d972bb129b58b735b922ea5739512a07477c2fb93971bc1e5aff72d7c247

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