Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d58e24005068fd…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 07:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02fdb20b05273c9a9e0f86fdcbda1d6b SHA-1: 20613d01abfe27433aee830d56d803f5273199ac SHA-256: e9d58e24005068fd78b34dfa54bfad27c23e80f14ce1ce5931654bfc4da74f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a trojanized payload. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to attract traffic and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=download+rush+rally+3+free PDF link annotation
    • http://dominoliberec.eu/images/file/files/79715607380.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/xodadomejulegip.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/vaboxevijakona.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/narodejiwebexufibugexatol.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/30263938877.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3fdc6dab5f2c570bfa07e6232142fc2d/vukolux.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/amag6830j2lnan2364so49nqsb/tifojisimodevinimufu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614238b95e2a6---kerelobe.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/74009833947.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210907_040431.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090106043073.pdfIn PDF document text
    • http://domosplast.hu/files/file/vawijidareki.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/6006511420.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/8991977814.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/vetowefonusiwixob.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/29446879067.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/79076494449.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/rajivunizilotexevot.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/bolosenufadojiti.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/lho69bcl7g3t3opf4o76vrtr1m/91730763434.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/magulowuwalovovakedafudob.pdfIn PDF document text
    • http://adice-area.com/pictures/files/21137135572.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/56750255652.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/xepapoxa.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/winolivejobaguperigezaser.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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 10732 bytes
SHA-256: 11665af55fe48638699aa689e87c4d60e9d8dc455f3b8985d2cd590361f88a87
font_02_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 16732 bytes
SHA-256: 05bdf93bcabbfaff6596c914263b3434551bfbe369d81bc2f86912511b1bf3fe

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