Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a4c6f173e58da2…

MALICIOUS

PDF

85.4 KB Created: 2021-08-11 11:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 936696d23b29bbc83604ef37cb472e48 SHA-1: 6d394d8ecce8ad8578a005a0c5e72dfdf9298f5d SHA-256: 06a4c6f173e58da2ac481e5e8658391748a563bd330934309e8f88d11d9802b9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of a URL with a 'utm_term' parameter suggests a potential phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=fan+of+guns+mod+menu+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C PDF link annotation
    • http://fitsiluet.cz/data/file/2951086636.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/oo84vgc5vse618ldu64i8stfd4/zoserowimaluniludi.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/jonipufapexigutegasit.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/pixaxagumekuvave.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/menasipepip.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/retamugezilodipolexez.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d858774506---88591914585.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/37727633610.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/15dd6142f943f4324c3396329f4c2693/kirerujuxirerusuk.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/26622742939.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7a6d9dc75445f3903554abf01c22e8be/61819565939.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160944b61d19b4---latazokaliwutuvasowoniki.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/1773371261.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/426b9c032c50c4ab2d28b6754b2c119d/27993904706.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tujejabeterikugokeme.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/mipuworumopizoza.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/281e1e11deac1970f145e087857071ac/94793972710.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/pilimirimivuwopise.pdfIn PDF document text
    • https://rosycaffe.com/file/mogulegividenenukebum.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/fowadevebewa.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/duwodisajapomijuzufirave.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7f85507c1e8cd22d10cb7e80b7ad1d1a/91084525409.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/xowasipidipuzon.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee14e2a42---45876233840.pdfIn PDF document text
    • 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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 22160 bytes
SHA-256: d042712041446569918420797bfa18f66a3d94d9f92f1ec3e0758d55ae1ea75f
font_01_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 11076 bytes
SHA-256: a02ef4e76452e02f118411f5fb34fb78c7211be8ad9703c6db0922b9da153161
font_02_sfnt_off00012d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1