Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f3a4b745c56cab…

MALICIOUS

PDF

75.7 KB Created: 2021-08-22 01:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4ec4df217104c5ddc557867d7bc5c2c3 SHA-1: fc23a48a2b3e24a18dfdb13fa4e1cfb4d85fc0bc SHA-256: 58f3a4b745c56caba45ca0af13aa035f6c4226c469908f6c457170e3cc5e117e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://sporteambiente.it/ckfinder/userfiles/files/94675523854.pdf In PDF document text
    • https://suadienlanhhanoi.net/upload/files/xexemupegufokikedejef.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tatol.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/63713316306.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ab76ea9af---61634496159.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/delalukukizederawumotageb.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a8ea9e3179fbe314ee8ed86a247be422/56545190270.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160beb1643c26e---13108158816.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080239d727d9---32750388831.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/43764982452.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1or7s5k6kp55lkls1rtmonslod/xoxofekipatal.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d44c940dc62---91766653184.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/sudumiwumapasa.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/jazipalogukomeso.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd9453000b---49270391374.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/96898701571.pdfIn PDF document text
    • http://starringthestricklers.com/clients/2/2b/2b6f34f03d9ccbd43d04a050b3ab825e/File/38861246613.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/22667898373.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b583444fd9---tabivaj.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c9b4e3c75dc0895f9ee305a6031d2910/fabik.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/sokanelip.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/71268b93572c10236ffa4ac32a802a34/55848557795.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/kotapujotalerujeri.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161172e03317a0---1297904757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=la+ley+y+el+orden+uve+temporada+16+online+gratisPDF 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_off0000c2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D6 11192 bytes
SHA-256: 91d47b2ce14d1aab6efd23d3be5f0d056e98718291569f81adcb69d1004bf747
font_01_sfnt_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 16324 bytes
SHA-256: 8b0534eaa04a6ce6f98d2ba0f4bb0bdd7b4d90855bb82d6557911b0d7abee841
font_02_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1