Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b5193d491eed51…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 06:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66c04aba7346abc3d6540929618c0646 SHA-1: 8e37c4efe99d84108a872803e99df8a6c003b36a SHA-256: 13b5193d491eed5132a9ce666774d828dfba275fdf6d30ad2547535948edfe74
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://puzynowska-kancelaria.com/userfiles/file/58275774074.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/bq267fk76f3ftsu7i9m7dhc0h3/12082621573.pdf
    • https://dwitunggaljaya.com/sitefiles/file/83234478441.pdf
    • http://upbfassadenbau.com/upload/file/netejirulamiliraleg.pdf
    • http://hoshitorionline.com/uploads/files/piguxajibigup.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f080397f5b---25050974651.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f014f8a5accfbe938e1662e976d907c7/77318194036.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0cdd92d8---93027627656.pdf
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/63580447171.pdf
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/josekuxenajor.pdf
    • http://guchenes.com/d/files/xavokafof.pdf
    • https://autotrans911.com/thread/admin/uploads/file/tagotavafinisuxipuvo.pdf
    • http://www.deep2001.com/images/library/File/gobaxolaripixarisawamiteg.pdf
    • http://perfekttorun.pl/pliki/jufadibutotumupuj.pdf
    • http://etcad.net/np/upfile/file/denol.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/46da3d525857eb38a22f5f10bb3ccb17/11256942115.pdf
    • http://tourgrodno.by/images/content/file/71378832759.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c3332d44471---46535493829.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dff978352---zasaj.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h683npkhuk894412hbgttpqar2/59008084811.pdf
    • https://lifeteacher.tw/uploads//files/202108091744378559.pdf
    • https://activepymes.com/pub/file/fejudi.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/abd50dee4fce86603d022c2f03ed3de3/mitojuzelebominapa.pdf
    • http://mariangelesorrico.com/galeria/files/35363708398.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/e2b5184d8b0aaddb5c684fdde7fd0113/63272445686.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c2209a6f48e---85779735717.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=urdu+novels+pdf+free+download+pak+society
    • 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_off0000c613.bin
4b6468fb6d8c94a01db7df546a38d1ff0666efc942f8f0141ad01d30b6e8d06d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC613 17736 bytes
font_01_sfnt_off0000f495.bin
06eb30fc6a69d087ddc96e57cd8ef565c1b391864d60391de4a40e4437e67694
pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 11076 bytes
font_02_sfnt_off00010e9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 16792 bytes