Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2edc9b7c3bb9ff…

MALICIOUS

PDF

81.4 KB Created: 2021-08-10 03:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f80692818fc93adb32c7261f818da61 SHA-1: 2927fc2dceab7beac0f6b1ca6a5d2c4c619eb146 SHA-256: ab2edc9b7c3bb9ff4af6f947d58e259eacf7ada968fa4dfa11d97358229e74ed
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links to potentially malicious content suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://thanhlapcongtykiengiang.com/upload/ck/files/jibatobafukazefegupiw.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbf282189a---51728840909.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a096dd0ecb5---tudupoponud.pdf
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/66226714368.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/23508f4f36c43980c617846e8d48a1ff/42632241275.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/fuxosisuxafexejusow.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607547e0e22c7---jebizufukopubisi.pdf
    • http://insfilings.com/skyzone_classic/upload/files/7256634711.pdf
    • https://ludifrance.fr/userfiles/file/wawix.pdf
    • https://tch.lu/files/files/tunilufana.pdf
    • http://hungbuloon.com/media/ftp/file/32172752334.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b790f719a4---46664747134.pdf
    • http://mega-treid.com/userfiles/files/90285258780.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/076fa543943b6d14f2647a6dca43c70d/70609501193.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/fmci4e7s3c8l7a8dif8du75f2o/gapubedelesowotoviru.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5c7a35b6e---92974740202.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/09ebba24b55553d66ebca952b2224c23/20010283613.pdf
    • http://jshtextile.com/UserFiles/file///14916548513.pdf
    • http://studiotrusso.it/userfiles/files/bodibuduva.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2c26c00bd67687f205d75b540eafe0d8/xewefedexuxu.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cef024de39---jasagitom.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/a9msqlij9lj90g137hjvo7k7rd/79823590307.pdf
    • http://safaraval.com/basefile/safaravalcom/files/54166919773.pdf
    • http://evola.it/userfiles/files/85616749551.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d46c36cf---40573940640.pdf
    • http://frutapac.es/ckfinder/userfiles/files/ligaditelotilagi.pdf
    • https://travelstore.tn/userfiles/file/18462964833.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=exercicios+resolvidos+de+tabela+periodica+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d50b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 16792 bytes
font_01_sfnt_off0000ed1d.bin
b84e7623a48a14ba76202ef61c0090253afe829c8c115ccdb45cc5ff95f3e4e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 19540 bytes
font_02_sfnt_off00011d53.bin
ed4a420269bf1fe3331b521f323281bb05dcb391d36c282556bc0946cf9560dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 10800 bytes