Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb929cdc1971c120…

MALICIOUS

PDF

76.8 KB Created: 2021-07-05 19:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f4ba3581e86efd2e7f0afb55d069d37a SHA-1: 7b53a3c7caf2b194c5229b35954477f8b425b91a SHA-256: fb929cdc1971c120f97ad0db76d5e68f8e0bb4f7be09e1222baf0a979d1ef79d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting. These links likely serve as a lure to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af07d1a60---texixexapigibafigusugev.pdf In PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb930f0a6d---80646714739.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///29020952542.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ad2d8660---gigigexififatanir.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/pikinukavo.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/45997419210.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/21d10960b5f64f80b433a246347e07ab/33630277161.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/092f4fbaae358b920856c18299c36307/10607656584.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba10377d539---zuxagiwukinu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cd969a958ff---18213020314.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/sejagadifizogafiriwupuka.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/40311115790.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/35807006251.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f80f2a7ce---pajeponiwulofatu.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/didakasevefek.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/64f0c54bfefdd69c9cb402b6d1c64187/merikaraw.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33972edab6---wadomeki.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5c4f7c3c300dff544edc4fad0e5fb556/dibajojatu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2p3e5fjl8m178roa23hcucl2rh/86817060679.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a485cd723a289f29ebff8a92d1b4a217/zaretid.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/30125251283.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/59388219087.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/67643159522.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/talopobepejofe.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/417u7c17qvd9am5gfgsa7pi86l/lanebamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=meaning+and+characteristics+of+societyPDF 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_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 16772 bytes
SHA-256: ae164e5ae80e2a6db9242766de50d5f9c42a403a860fe2deaf05fb0e96f396a0
font_01_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 10816 bytes
SHA-256: 9a2dc0fa4f87531fbe6b4071f0b08f916686e374aef333c2c0cba944c617a369
font_02_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1