Malicious PDF — malware analysis report

Static analysis result for SHA-256 792b0166c570fdaf…

MALICIOUS

PDF

75.3 KB Created: 2021-07-17 14:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 670daf42fcc7f77d30d0bf94ba0f21c7 SHA-1: 793f3d72ad82662fa21bf7172b063bc62796c98d SHA-256: 792b0166c570fdaf6cf36b010f6f3eab654c01eec2cc3530deecc676aa18d87d
156 Risk Score

Malware Insights

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

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 numerous distinct hosts, many of which appear to be disposable or compromised. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to distribute malicious links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://norilskgu.ru/userfiles/file/vufelupebodawaluvi.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///3757324757.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/207u1atqse29nh79rccgd0f2q8/wemeganofoka.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/diniwinomudo.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/68366749897.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f30baab1c---11563900523.pdfIn PDF document text
    • https://mollis.rs//files/83942248916.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0qm959diom9jc06v7vql6to90a/26626925423.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/bokilojisefemima.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/85126841635.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b32756ac5a3---gosubux.pdfIn PDF document text
    • https://businesslife.com/content/file/32680632527.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/84443170077.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1de2a0d463---15487142206.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b67085eed---tifisozanujoxevatedepar.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/6983226622.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7fc9923115812505b41b89f9c50fc796/jonolonu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/sokoximisuvetuk.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/robipap.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/desopupefukapevef.pdfIn PDF document text
    • https://stopserv.ru/files/file/sexesufodamesabasuk.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d56b0705613974bdb324103c85fe5205/85208085843.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hblue8niaonv7nbscguk0hgoo5/jexubux.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/36352612361.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/2747d13e13692a31af272924c8552650/wedisanazowevetupeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+you+convert+a+dwg+file+to+pdfPDF 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_off0000c2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 16704 bytes
SHA-256: 07d48018963cba8c3b6ddbd8051d149dfabed09e2c820b15d78a3f9c375fe057
font_02_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 10984 bytes
SHA-256: 20a632d452efa1eecdaf498389915f4d26c326e85071a299ff449ab9eba65a22

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