Malicious PDF — malware analysis report

Static analysis result for SHA-256 024a16461c85886e…

MALICIOUS

PDF

126.2 KB Created: 2021-06-28 10:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0e77dd8f9d622757a958e88568ff8435 SHA-1: c898dc9a6c24a96b6ae26243621bf28fcada33ab SHA-256: 024a16461c85886edb6c8373b58268259e2227d0d2a1b7d67aac3789f67261ef
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://queure.ru/uplcv?utm_term=weighted+v+sits PDF link annotation
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080507b68305---23756459588.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/zuzepivotumoval.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5o3maipj32d5b6e31r5hcssrsp/37595162078.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/2218397253.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3165f407b169de51a96aee8d82b45db1/xumedeb.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/833266efe979a287e7dc4e4e3490cddc/viponunupesofogixol.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160994373eb405---kipavobu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/7ac6e451f2898a907a3f5f1d286c1455/zizorapenodogaza.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/937d9d0dcca0e763be02d0e7af285cac/51721515961.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c567a78718e---wedotoledolumewijaxa.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3e03222b5---70554721633.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67c8e7833---tovakij.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/75cf5137b5a8eb620363a42a650a31f9/44284824072.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/fujupaneviwejizubegelesoz.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/87c969a510c03d403b9f0610c54077b8/kafimaganoxopavefiwotifop.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b055cf94739---44354714240.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/52122761550.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/bubeliwuludakasefidajug.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/25101363935.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/nelefadipaxiz.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00056ea1a2---28926636763.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51a063d83---88826565423.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/62235784737.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608987f05e1d2---visem.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_off00018da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5BF 10052 bytes
SHA-256: cd2da33a1d5862f64cde99dba13ab7523550acf5a295b9445775d02e8259cd8b
font_02_sfnt_off0001bc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC0B 17972 bytes
SHA-256: 6525c1c7854761a481f23427bf95567de32a64811eaac723590d9cba5b0932c6

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