Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7944e94f93d198…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 18:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e18714f0eaf4beaf745a5b1bf353d6e9 SHA-1: 4f47fa2156259b79f619bc1a49519f56a24585c3 SHA-256: 0a7944e94f93d1988c03f904f218bcc58c4b8d012a84f16586e421dc7a44aaaf
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pegastelco.com/pictures/files/89601914184.pdf In PDF document text
    • https://uangraja.com/contents/files/mukogipevaxosokafisolora.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/18590094870.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/bovova.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/kuxesogipufejo.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/91146315791.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/98461733265.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/036d6cef82c5a718df80c57be73068a1/babodasov.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/wudopofopewufese.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/59256139396.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/zijijetepemadi.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/7181210822.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba22a02d4d---49852324445.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/95646038007.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tobumejoda.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/jonixosufiwi.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/72032276321.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/medebisiduf.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f18c62f6c---51632809394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=easy+way+to+get+gems+in+clash+of+clansPDF 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_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 17828 bytes
SHA-256: ad646c2e699b3f8154ab6d2fda5396097803addf57af12ef2d62bd786953aadf
font_01_sfnt_off00010971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 10868 bytes
SHA-256: b145c4153a962f9305b95c156b0624da914e937ccc670b436e269191e5463b3b