Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2f1b8f32c12f82…

MALICIOUS

PDF

108.9 KB Created: 2021-09-05 10:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0822c2c3ecd0eee1746355c7c5bb5262 SHA-1: 90938e72738ba2d52e12d5a7a6eaa2495a9d2b44 SHA-256: 5f2f1b8f32c12f82c667f249d1547967e0a1fff6f5e9921ddc4fd3b7f89fd1fe
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 0.9972

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://biomedchita.ru/imeg_master/file/fuvofopufoviledo.pdf In PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/dusil.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e920ff7e2f0---92206518549.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/botavudiletilipede.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/78192938750.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/92416647354.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/g41arfetf6mtvim46g6e1hvkbs/zaminad.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/mogomezorogowusubakudufu.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/pipudugazoburativomamonug.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/56h09on3fnl7mevef1lsj70t30/pajigivigugogoza.pdfIn PDF document text
    • https://afayl.com/userfiles/file/lepibosolelolajesolex.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/528a7c90d884f1c582a3b9ee886f4ecf/34883453799.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/xexupasaforovalitu.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/74721865497.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/0mruthug1didondstvef8c633f/95106977710.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118bcb9a70a4---buxilifujupasuvojanixulo.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/ramavisafaligugewozixizo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4cb06c8f64c4c23f30d0ecc7dc8fd329/bijagoxawazevosibix.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210822090212.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/fosizawulareketiseviduf.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/jerekiwolajiguzagadav.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/fizewanaw.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/negad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lupus+eritematoso+sistemico+fisiopatologia+pdf+2015PDF 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_off000141d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D1 11344 bytes
SHA-256: 8149c76c4ddb309e906203f23542e18b17f035337e43e5258fc29bd11832f94c
font_01_sfnt_off00015c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7B 18884 bytes
SHA-256: f8a972dfd0474d9252c2f44696ac732503253025ae2932b4d19f3c28e3820b7b
font_02_sfnt_off00018d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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