Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6946765a171a53…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 07:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ac906c4fbad3308c55760b12f2a5d60 SHA-1: 424547a76ad87025aa21b39685857614fc63d90e SHA-256: 4d6946765a171a5335be3be42bf2c1015e5d5727250f360a140b3aed64cb4824
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://juniorclublivorno.com/sitonews/images_upload/files/kujikil.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613272c56ebfa---kitopulavowalanof.pdf
    • https://membermimpi.com/contents/files/xenipupopi.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305dd14eef4---muvemiwora.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c92266a3aken37ss3t9lslf3q3/valabogubifuxoxosolejud.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/bapenetefukuvifiseza.pdf
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/vezolofopufegaxuvugiruk.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140139d646e0---11715642404.pdf
    • http://inimtrento.it/userfiles/files/mamale.pdf
    • https://villanakarin.com/userfiles/files/37938047473.pdf
    • https://projektovanje.info/userfiles/file/13371207752.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613963f2b17bb---nodulokevezelot.pdf
    • http://polipadel.com/userfiles/file/refosogekufagi.pdf
    • https://gres-k.cat/userfiles/file/54379861018.pdf
    • http://finalbrand.cz/upload/file/96120661799.pdf
    • https://cbconsulting112.ca/userfiles/files/lumagifelijetajatuwanubev.pdf
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/aa4f8e9afdf3f65f744f2ada41192045.pdf
    • http://cmtoolsrental.com/user_img/files/wuboxowa.pdf
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/fufilovatudepiwefubuwizos.pdf
    • http://belean.pl/userfiles/file/rigefenibi.pdf
    • https://nanyangtextile.com/userfiles/file/85146155554.pdf
    • http://micruts.org/userfiles/file/somiseximutubilejera.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+set+static+ip+on+raspberry+pi
    • 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_off0000d895.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 16792 bytes
font_01_sfnt_off0000f0a7.bin
d8350b504faa796f4bd257796862148f79b503b61c1034525e3e661a96a3d116
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 18256 bytes
font_02_sfnt_off00012044.bin
68add4c0fc0a8109bd428d677df4fb5bdb9a9df7a0f3bd111c5d92a7c0b89d05
pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 10652 bytes