Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ce0ae0c3791193…

MALICIOUS

PDF

80.6 KB Created: 2021-08-07 15:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5da3fbbbb7d78ae9cef99dd34918c7b SHA-1: 279233d087d3df276d736df65bf982c83dc70e6a SHA-256: 74ce0ae0c379119302184b1ae154bc49f5516dbfd5cff5bba5d826be085245c6
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to potentially harmful content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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://queure.ru/uplcv?utm_term=etowah+county+warrant+list PDF link annotation
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b548e89a01fa0344dcdbdd32aadb2d61/31758823574.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa363419e75---56921057855.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdc1e6d28---xeberitafepetufitiludex.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e8be9daa6ae9483391d522577b01078a/nutusimoruxamironigezi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/71dc8f5116e75930eef9305c5e36363a/pizoviwi.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/98487022758.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3e5ecca6---26631344196.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9077ae012b6542aade5ac15536f3bd1e/madagadovepexukuriwegi.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/roxanepojogisufasal.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/movujojuwobazakewetudav.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/15706555524.pdfIn PDF document text
    • http://www.toptehnik.si/images/ludetala.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/guwavipo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4d31af7e5---65906979619.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b5b015293---tibijodirodowikabe.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161001cf4bd46a---24064729726.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868510cbfcc---76652735162.pdfIn PDF document text
    • https://kueapem.com/contents//files/rewufeg.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/e0pnqmtcbhuel918or5l4i5ef7/18753067875.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/jozin.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/rjtghml9m3gpevcd052r00dv7f/59106258711.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/56988022428.pdfIn PDF document text
    • 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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 16596 bytes
SHA-256: ea3b938e806283024cd0835b0207bf90335e385f11c5b746930e8ee8b56b969b
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 10480 bytes
SHA-256: b5d8b104db7824b036c074fe7abdc38b6de2f49837372e5e0f22dcc352146de2
font_02_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1