Malicious PDF — malware analysis report

Static analysis result for SHA-256 a415fa97fa07afce…

MALICIOUS

PDF

81.7 KB Created: 2021-06-14 18:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4403eba0a0f253a0e4549cb276af9fa8 SHA-1: 427a16a53d57431e30639d55f095a1562536d50c SHA-256: a415fa97fa07afce85bed830c3228daab379ae426344ad3745f439545ba797f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

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://medvor.ru/uplcv?utm_term=dj+aqeel+tu+tu+hai+wahi+mp3+song+download PDF link annotation
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bffe448c9d1---35328573163.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/66667402454.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/30247238951.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/46944388422.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812e772ebbd---10134407011.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6016d7bed36f08d09b4a451f01abdfd7/11998188962.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e245992006---932824793.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/lusudikezefegepisewovixu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1fe3afbe6---fenekilelirekawukateleta.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb25e543b---30997498288.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/zipimesoramisomatejaren.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c45c157a371---24430186700.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aab69887cf9---97068563047.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a260de4e01f---sinoxinireripubinopavor.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ec96b9d69b791d580833c99bebdfd144/1826039328.pdfIn PDF document text
    • https://t2sc.me/userfiles/84403475509.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 5736 bytes
SHA-256: b81acb8a9a3ad38fa837907116fdf19f06a2c57063655c2016610aea66ddd4f4
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 2116 bytes
SHA-256: 2d35fe1b112251630f6c3e185fb4bf58c6327cea99f60afab3ca0473214b5b30
font_02_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 11544 bytes
SHA-256: f36c154a8c74679022f4f1e57b29debf5e3dc146f332c7aab2ba8cb8c131daa9
font_03_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16456 bytes
SHA-256: d6a5cfde5c1fa8e2b609ced667195f3624df280c16a61c74f508b381b8aa1239

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