Malicious PDF — malware analysis report

Static analysis result for SHA-256 be93a113968ffcdc…

MALICIOUS

PDF

100.1 KB Created: 2021-07-02 05:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec4b8264d6dbee4a50bf7c06ade4d0b2 SHA-1: 7d415990dbddc2875eb57d0b90f625ea5e76c83f SHA-256: be93a113968ffcdccabfacd64cb081c673bfb1aaeaceb2fc53a211e57a53eecc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or facilitate SEO spam. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://soudurelauziere.com/upload/editor/file/92107822688.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/uj0l3gpe2k1e9250aop2l3e6gi/6915331991.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e3136069---39652982164.pdf
    • http://gianniarnaudo.com/userfiles/files/mawuxunupidotesekigobemib.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096f7bd4ac61---84144644475.pdf
    • https://antae.be/app/webroot/uploads/file/74004569627.pdf
    • https://eltonltd.ru/sites/default/files/uploads/rasozefegazudubip.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/lngjbj0i302clrsgvoa6gepo1v/bukiwififoz.pdf
    • http://songpinhao.com/userfiles/files/70105801580.pdf
    • http://liubeauty.com/luutru/files/37178062878.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210602_3310BA600EBD3DD9.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/7e3812f93edb83cd0c93b14741a4effa/47657191240.pdf
    • http://inannamsao.com/uploads/files/dikotefudumevomizawila.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074197414d95---famafumon.pdf
    • http://www.moyekolodin.com/files/76998748592.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d2b6806ac---22546516744.pdf
    • http://ajtoablakcentrum.com/_user/file/51430845243.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/wojimuxibugig.pdf
    • http://autohondl.cz/userfiles/file/27713280466.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/02d8e1889952fabf7a0b559faf3e0daa/59653772158.pdf
    • http://hongshengfish.com/uploadfiles/20210603/21060320283316916928echc6tvr0e.pdf
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/fugebupiran.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/is02cktuotplni6ig8kf8hgmrg/zekekabajaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=alchemy+leveling+guide+wow+classic
    • 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_off00012691.bin
d579d5ca8c839a5b4334ce118c373cab40030a5650692122d137941822564eb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 10964 bytes
font_01_sfnt_off00013fb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB4 16792 bytes
font_02_sfnt_off000157c6.bin
8f64a4a3adad3490bd7b8e87d1081eadc00f32151562c649541c9ba0d17171cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x157C6 16644 bytes