Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e854f10ef76d12…

MALICIOUS

PDF

87.7 KB Created: 2021-07-24 22:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 1a3daecea01fb48adffdfaff9ca61052 SHA-1: 5b4dea379775d4d5cab64c7da2a9623fc70b5b8d SHA-256: 86e854f10ef76d12df70f30915bbe8c5c1cb136b1dfa6a867cdee289829245a0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8942

Heuristics 5

  • 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
  • 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://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0b45ce1dc---15024646008.pdf In PDF document text
    • https://akapacha.com/userfiles/file/wexajuj.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2039a6c9ff5a8c21963e900f06f46576/lovajumevigedawafudo.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/nuwefobonipulo.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607837e6852f0---10481917652.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081209cdce53---43805752927.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/db1d0e8844bcca5bea7c677e250666c2/12366727679.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38833b356---24448418966.pdfIn PDF document text
    • http://riph.pl/userfiles/file/wazopunabafuzituze.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/59877637001.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/wikibewutowuzop.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/wikugukadijo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16076194dbe7f1---kivapufox.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1c78ad297---mirakuzozujozeroxod.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/42139229873.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/21363f8acb9437feb24795bd8fc81112/tugolifiru.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/3740505401.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef986b61b2---60510847068.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/8883936629.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/wubepapaxa.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/3367700864.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/92026b6603179cd3748c34a277d6abf8/51939838067.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/vun396j1umk2ifvu2e7gjqk7k7/kunuwabekosubudofavuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=jumbled+sentences+worksheet+with+answers+for+class+3PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001171b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171B 17396 bytes
SHA-256: e42a5b7394469469d2414ad24829731e7e85610cb807818fb331e3f48c7b2eca
font_01_sfnt_off0001445e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445E 11324 bytes
SHA-256: e9b4679cf89193321bc3d355a3d7d044d17352ebbc2986f37287c66805a1c4a8

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