Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c04af1cdd169c4…

MALICIOUS

PDF

60.9 KB Created: 2021-08-08 11:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99dabbb965608196115eb2f90cad683c SHA-1: aa46189e500c3fefa399cadfef9401e6f7e2bb87 SHA-256: 99c04af1cdd169c409f54be2ff9008ba5fc6aba7d59c35288bef4f2e9364d7ff
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7039

Heuristics 5

  • 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
  • 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://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/56094dbf53c697e9200345ca9a601ff8/56633085152.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/72e88c6e1d5406ef74d192a4b1d051b5/80500209902.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/69790341636.pdfIn PDF document text
    • https://areicon.com/images/file/14796614391.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fdc692320---25492104523.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/71199625964.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/fawuwosokajazugonav.pdfIn PDF document text
    • https://domilot.com/uploader/files/39743933962.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/6f88b910a14b5dddc3abec51a2cf3857/56499305619.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/44097293867.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/xefepolimofawufuteraluz.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/433d31e5105f9302189b1558c5eb99eb/69760661981.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/birid.pdfIn PDF document text
    • https://ms02bet.net/contents//files/dagepofikebimasokepuwulaw.pdfIn PDF document text
    • http://airfa.it/userfiles/file/zerakosapa.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/422f489dab78bbc135aa17b33b812b9d/sepodubusefovo.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/11094289675.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/lamojotipiwapurazi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7e08f0501---ketelojelarumojajoguva.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1s83823eovu10im0g3rig198j0/46069172944.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210728044306_mrk7lw.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad6c7ca6d---54589942305.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bf12ac40---78512545621.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/rubebi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/dcbc8afa583debde31f4ba1534b028e6/13741144783.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/15024063883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=zap+suyu+fon+m%C3%BCzi%C4%9Fi+indirPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC860 18360 bytes
SHA-256: 793c276983c62e2be300b26b08381f63679733aa793983c50fb2c9d3a813d00d