Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a17bf5a139d442f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 13:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92e00dd219ba5831a369e8f1c00a036d SHA-1: 98180d3dc8b35e825c37da9e1a42d31fe5f18785 SHA-256: 6a17bf5a139d442f22b392067e6a81a1d2a5971bb1c8c0b94123b8607d09724e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/154677b0ebfbc04843c1c3c3254b1f47/kukodarodotam.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/h4di3ufmne384i0pllmu8qmdu2/93543139578.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cd8def0ed7ed38ceec1bfaa4b5826216/giluneli.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/54659676063.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8486a74132---42409307001.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/55696281582.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/novipebegedewaxejogup.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c226e64585---gupedasugixej.pdfIn PDF document text
    • http://quatang3t.com/upload/files/riboxifinuzelov.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/tivasab.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/64445485148.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86dbb521fe---jenikusogunuva.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/5fe9ff14a94240ca0d6c494ea4c9be12/sejoxeputuvozuvudapukir.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rhutnnn00ek9la2ok90gd9btp6/28927044088.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984b77749e7---160647167.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/74669524296.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc6c7fec5---73575728183.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210504020556.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/zixilikot.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a63043671b2---lenesizabupeluwolagit.pdfIn PDF document text
    • https://businesslife.com/content/file/luxevez.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eafb12670c415844984f69c264db9a86/55156246535.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/6462624228.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/74473810334.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/7035a5e30be1770161ce41399872d20e/fobeguzexagalogiwev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wellhead+assembly+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_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 17160 bytes
SHA-256: 0c1641b6e4f948e1b63a73ddadb62b2217238aac5e6ad2d52807da6c8daa6967
font_01_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 10496 bytes
SHA-256: 97ede9fae6f7afa8e2aa54ad3b9e562f87112434e6edffae7cf3ae80c7c62eba