Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d1a8cb6c68fcc7…

MALICIOUS

PDF

139.5 KB Created: 2021-06-12 16:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6386d378e75ac4d00033979a048ec68c SHA-1: 3770f3818b6065d800a8df8779885d0e1afeefe1 SHA-256: 08d1a8cb6c68fcc768b7322bca240f785f2e58a020fbf0732a8a72bf8f3f0ff2
196 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 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=sarkar+telugu+movie+torrent PDF link annotation
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3949c376258fcc1eba0c5276664ed605/pelofapilisimu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ijra4la235r1otbrl1mb3847d2/zijuledagokep.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/323843785.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/lumejutinoxamusose.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757155613f1---78223951063.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099cee37e1a3---gaxiluwakoji.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/21932784170.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e883ce0c69302c8660017ebac5202283/vowikemobasuvineforeno.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/8e8baa358340850d14ba20e094915067/94880224601.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c4884f78fc5ebade57412a1a85c49f76/75218459190.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd4b69b97---gowejatesajaxuzijeke.pdfIn PDF document text
    • http://www.celso.org/download/29993463931.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160829cd7b8ba4---30005036945.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be83a2b121---29159209285.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f32a1d553---tererin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001fbdb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1FBDB 20364 bytes
SHA-256: df4cf72383850079db16d0d50bcfb8a1af4eedb30a93836c891edb3267c6ac7f
font_00_sfnt_off0001a27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A27E 5052 bytes
SHA-256: a0f3ac22344258b6f089f9bd0bed84767c4adbb67f374b2055f95731cefa83e0
font_01_sfnt_off0001b39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B39E 3476 bytes
SHA-256: 1066eb3dc951cd923ddfc099a550f350d89c51bfca5db20db32bc7a2a2139173
font_02_sfnt_off0001c12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C12D 22732 bytes
SHA-256: 9dbeef49b274536bcf93f364aa68602ffd49be1479a434f3f7656cf683cecd1f

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