Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e4c317e8b7ab61…

MALICIOUS

PDF

84.8 KB Created: 2021-08-31 04:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: afe35436ecd3f7dc9a1a6a7620e8f2c6 SHA-1: 97d426d42f3534df2b7cadc3a389ad69b2021fd7 SHA-256: 05e4c317e8b7ab61a0245ce54f7aa97889f5dd19778f656f26b53eb19709cdc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://srihemkuntsahibfgp.org/hemkunt/userfiles/file/limemajebomidebogujekinok.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/42aab588ddb221a9814e9ab41b9508a2/5204227472.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/52937647377.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/1051f9ff7e646c97ecf064502549c5a4/41799106647.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be07a64218a---retaneg.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078519341d7b---purovatunemezanosalosopa.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607735eb84432---nelimo.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/59524641679.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/purumukozusunuvuneg.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/gabimikivetegiw.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/jisixedorisobu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/e0d6c2292df9e381aba6629b545ef9b0/71843828017.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/vizun.pdfIn PDF document text
    • http://ausafe.net/images/art/files/83851487132.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b9a2cf8a2---pajunorakagora.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad97e63856---vexavajigegenoxebalu.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/85626554474.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/6295753060.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/33c50ecda8f9bde879606b597c10473a/daduvanoriduf.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/pewofajif.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/51210839777.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/12461945860.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/35396568854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+draw+portraits+for+beginnersPDF 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_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 10844 bytes
SHA-256: 8a54070f5865e69258d6c36a28093fef2e0d55bbe873abcda3f72390543ac836
font_02_sfnt_off000117d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D0 17424 bytes
SHA-256: 47456017ba5a3c8f2e8a6dfd8bc97742e8f342452f1370d0ccb00b6912d96f30

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