Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b2e654a78cd0bb…

MALICIOUS

PDF

78.5 KB Created: 2021-07-18 15:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 495b9d9789bcb0bb5534ff8f1d1233c2 SHA-1: 1c34157636d9ed4bac28486c1e003d30d0d0525a SHA-256: a3b2e654a78cd0bbb6513034073edfea4bc822cde1fb45aa9253e17bbb7910b3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://jubileejec.com/userfiles/files/63169941055.pdf In PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc268db886---xijexixil.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac75806a57a---48021928781.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/bewijufaxedaleb.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dbeccc02998---49724792330.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c221bc698---zipinivuxewugaparaxifimaj.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/mabilututikosinoseririla.pdfIn PDF document text
    • http://rurisnet.org/images/file/50661557920.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tv6nfunpc0bb38u2cfgh8ci1fo/80774429893.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4d777e1c---66094425880.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/m4udfuhkjro129k5ubcg0q15t3/54211256733.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a628712ac3e---17940291090.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/9fouov8203giob9d4usuh8aqsi/44913405403.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fd94d8510---80049288626.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/delotibapixozawubele.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/1hu8l8hf4t3hlcjspqhmebh0v7/kajulibefupadunuzigiseti.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160860f84405f8---57490453286.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/30853207317.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/nreukn436ddm57a4uj37n78ouj/kuzikipelikunilubivo.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/u5fhmuq29abdqt638gefoqigu0/rozozugibikiwu.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/dupovixativu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tufixepedumosuxejimenina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=learning+enrichment+centerPDF 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_off0000d258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 16852 bytes
SHA-256: 2ae7ea751874e29c61afc81ae3dc8f22d4ed28aac91934ec42072e1bf9d323d3
font_02_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 10300 bytes
SHA-256: cfd3636a4ba551932bda2e11483b06d745f0052a0719b81f7f1509d30c6a8fb9

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