Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fd3f88376502ae…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 23:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b641cd06e1de68b818e8f28654b6eabb SHA-1: 1c37c12851da87b0c8d12362e504cd965ac54463 SHA-256: 82fd3f88376502ae740266a04aee937a6df3aee677fed46ef99f0d03cdca9f2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lure users to external, compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ncn8e1e8hu1tqcr3m2lgtenfe6/77264929432.pdf In PDF document text
    • https://gadd-asso.org/userfiles/file/xilano.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f73728dad---pebekarenulunitakuxubeja.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/sodigegine.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/zadonebitivipesolazulolim.pdfIn PDF document text
    • https://xigmatek.com/upload/files/47335840875.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/15129287553.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/cdfaa9fb5b56cc101cb387f048282df6/jezasujefowi.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/68592566648.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/41876276049.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wulurupefobilose.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e908fa5528---77813137996.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/84042484771.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/66277816193.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/24067547836.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/73405687615.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f89f235a43aaa4661aafe6025dcc6dd6/93321941215.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baec80b161b---12305726099.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610c24da59d0c---lexizidinep.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb988a304dd---jodidatozet.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lutixuduva.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/dibap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=glasgow+coma+scale+pdf+deutschPDF 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_off0000bd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1F 10996 bytes
SHA-256: a5de72de2058f392ca6d1e0f9980ec235fa5c8b182b50d5acc083e218415fdfb
font_01_sfnt_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 16700 bytes
SHA-256: 003da2b1742eaaf92be8f24a25c470e08c7e1b130e7a2b25b91cc5dd008f9cd6
font_02_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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