Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f202237a2d0868d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 02:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75079635e284b47f1c29124474aada39 SHA-1: 017e52c8b1cb5f99789a93358685510c7d1cea8f SHA-256: 1f202237a2d0868dde9e91085f8c334b51f531cd16f0e6d8dab05493af4932b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of multiple compromised CMS upload links suggests an attempt to obscure the true destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3a05bd3fe---menirijimizegogujekadet.pdf In PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02e452b29---pebalotufudenedadowopat.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729bce17081---32697639385.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawizafibujufew.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/39070356577.pdfIn PDF document text
    • http://boldogelet.hu/media/9817002195.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893ab8d518e---7263927662.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7f85c79b01a3d21a41e1f8190a321cbf/xipodebovagajerorajazaga.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/37204638d50ac83f758bbdc85a5656ed/22580747894.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/lolafapox.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/gulijabivosajejokuxu.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/sorizawulafaxe.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/41569958670.pdfIn PDF document text
    • https://superchills.com/userfiles/file/54312303147.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/xemug.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/33526075022.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/85875275499.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/35305995460.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/jokibuzijefumir.pdfIn PDF document text
    • http://njxinbell.com/upload/files/wirokekor.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/63358258806.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8545d99d965d222ea9367f8841450653/18284626852.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/13705018566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+virginian+deadly+pastPDF 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_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 10692 bytes
SHA-256: 8d6674613dbe680d1690b2cc46a325f78df05eeb2f0febbaf044161d32fa0afd
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 17680 bytes
SHA-256: 0ce89397911788ea5e27226ce55b7446efbc6c2cb508a8eca1d7314a3fdc365a
font_02_sfnt_off0001338f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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