Malicious PDF — malware analysis report

Static analysis result for SHA-256 04420872a4c965ab…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 04:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a71a52667f592b5c0c4639f9fca5063 SHA-1: cb290758cef99ff4cf4d3083cb5e72bf2a439bd6 SHA-256: 04420872a4c965ab7febfa5c7bc476e16c9065265549fbe976f134bae76e547b
154 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of a link farm on compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8416

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 http://naszemotyle.natura2000.pl/imgturysta/files/37364521300.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f1214f52---73751985953.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c5e9f04ec---8509726178.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/xenefogujop.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/10408232985.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/bofise.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/falotigifavaduvibenevev.pdfIn PDF document text
    • https://cristalensi.com/public/File/sukuxuw.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/dazetomesizivu.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/tabulizederug.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/n7v2i1ltppvefcalkrcva7m3rl/wonubete.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864b45f0348---jevovodegozudana.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/52284714950.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/faxezimopasul.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/soxom.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/dodibutitaleluweze.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210903_53285B1097128AB5.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/gifuvoxoveratikotevibiw.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f1015ec56---18258337028.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609222b551194---zajerarafezivaxilesex.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e65258ce9b2---xametagivibuwajipiraxemi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53a48667e---vaxopaj.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2f316e0fbe090419316cd15cf9dc56b4/puruvam.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a869ef8e26b---sigewuramaf.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zapelakinisuxofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=executive+summary+pdf+examplesPDF link annotation
    • 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_off0000d1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C6 17984 bytes
SHA-256: 496f85adde3f9bd1adacd22bfd39870d587b5a95caef7da1318536c1b466af02
font_01_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 10920 bytes
SHA-256: 77f0db904b972738dbfcd772b22afd7400248ee8cd162639998525df7ff2a885