Malicious PDF — malware analysis report

Static analysis result for SHA-256 8926938d3abb5730…

MALICIOUS

PDF

250.0 KB Created: 2021-08-10 00:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 078a9f0c6ff779d04026b17d217354e1 SHA-1: 442d7cfdca7e3a64fb598721c2d416f7a7241b63 SHA-256: 8926938d3abb5730d30b2aa9334fdeb33d4f053b3a243afb4e0a38b2b17d32c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links, one of which points to a compromised WordPress upload directory. This suggests the document is designed to exploit vulnerabilities or trick users into downloading further malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8236

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.
  • 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 https://www.crqp.ch/ck/ckfinder/userfiles/files/toneb.pdf In PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/genanivafiluninojugemusan.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b19e53c9---mesuxujutavum.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd0a922afd---wokijejesagap.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/85247051994.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/50283714756.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kiwanile.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/12041427074.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/tunapelelagaxirozavojux.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/509385351.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/lirevuxavi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/upg3ao1uig11m8sc971qkeka3e/77481866362.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160770de39fef0---kerek.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/3946141551.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/pebuzupimamojaj.pdfIn PDF document text
    • http://ridendo.cz/files/file/mowuvupaxatak.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4bf542b8---wavitotawugijuzarazo.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e00acced68---41427217169.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/31810953523.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/najefevukem.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/74ef1116cf793c712e1eb55b11da980a/jexibe.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/5497577558.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/vifinofifibutuwifovo.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e547e3c886---tozula.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7708c2258---32030230482.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4f6cc57e97a17b177f28554c7dfd4100/wutim.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5840d0c2362d4cf5b770065dad5d43a7/tivixekekegin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+reborn+18.2+modsPDF 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_off00037c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37C9F 16744 bytes
SHA-256: 66efb932f223b8a2e3effb2743efeda40949c3b79121d62bd648643298b939f0
font_01_sfnt_off0003a775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A775 10692 bytes
SHA-256: 9e52517fd8bf124e674db52f652b633ebc34fe2d95633acbcc07fadc0e8fcc3d
font_02_sfnt_off0003c009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1