Malicious PDF — malware analysis report

Static analysis result for SHA-256 4797db0e87a79bef…

MALICIOUS

PDF

74.4 KB Created: 2021-08-06 21:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a72832f3992dcaea654aa99c1321d51f SHA-1: 13ad1dce5fcce1487add66870a41fc421962a702 SHA-256: 4797db0e87a79bef0feec52b3d160f5764f3f226da4c540d647451f7f5698721
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to potentially compromised websites, indicating it functions as a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or further malware distribution, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://studioriggio.it/userfiles/files/nulakemijejuke.pdf In PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/20713504142.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f71512b20---maxudomaxexedamiga.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607016c46650a---lasovadir.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/07f1ae04419da854d1cce8ad0fa67d4d/32302605774.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b2e4cbdf---kezimixukazigesenug.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/158d1b5fab737aeb727edbb494144abf/vovumijejonijaxodatodone.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6319c1996d05b50e95909760cbec50c3/xibaxifitavanatebo.pdfIn PDF document text
    • http://abc-tel.ru/data/File/79083291475.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///nugewoxadisozozofijeg.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e94e7225c5374ccb3583eda2241eb00e/80117127038.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d3fad71375f709e73c734e75989d4cec/bulevelixetoz.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/xufebusifer.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/88575398246.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80c7eb0e1---xulafepikosubavudodevo.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/gamukowoxagotami.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba15bd221e---12905378368.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/lqjb265vhrh6rggnqkncvjvcbm/70839597905.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092fd5ef0ef9---lezafipusemebebelinogu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781c3434781---larokugo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7b237cba---vivoxudenevivavopizadap.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a24bd58a2bce5eb309245a8c75995f9d/womoraraludigudi.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/25930976679.pdfIn PDF document text
    • http://seamacros.com/upload/file/39332320246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bhakti+gana+dj+songPDF 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_off0000c167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC167 15676 bytes
SHA-256: abca7425f001b45b9302c1f4081c5e1d740a341bd34b790e75f0af358376ac28
font_01_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 10524 bytes
SHA-256: 1e4a4006d2efe0a78325d88e8a9c0d16f38efc71653041f9566970d3bbb91596
font_02_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1