Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd102a87dca65ae…

MALICIOUS

PDF

85.5 KB Created: 2021-07-02 15:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b783e0c5647d22c394df50cb7a3fdc0 SHA-1: e9e9c587a387fcb63fb122518727515e6279d499 SHA-256: 2bd102a87dca65ae1ea0645c5d59fd0039caeb03dc0eb197aa6fdb5a7155c239
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • 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 http://aksaaydinlatma.com/img/editor/image/file/36850955745.pdf
    • http://keralabiblesociety.com/fck_uploads/file/58408212416.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077094bdf50a---gewijelesuvupopaxonuzila.pdf
    • http://begemot-rus.com/uploadfiles/file/2021061102052273499.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160731a62e01d3---55985121137.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecb1f3166f---9926360846.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947e00c4254---rotaxenivasevu.pdf
    • https://living-stone.lu/userfiles/files/joloduwoxapopubaxus.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d08180edfdc---donuzelipesifezajawopu.pdf
    • http://driscollandgibson.com/images/edit_images/file/25520609724.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/52d4596589b753e6d50ac923b3c52b8b/kozubowododibonu.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/bavamonokerelufotilaro.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f24c618721e9f43af749f777033fa999/volenefedevegubiwabimo.pdf
    • http://smit-electronic.hr/upload/datoteke/11245500837.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/94529635496.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd64384174---63528593128.pdf
    • http://sola-brothers.com/userfiles/file/bekanazogidamedudirosa.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a4bfd75d8eb4f11a6d067ed142f49b21/93919089740.pdf
    • https://weddingitaly.jp/images/file/38660392062.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd94fb3114---goterafijanadovasun.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8552a768d3473a0526644c614e21ce8a/vexulomomofexeb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+mods+for+fs19
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfe.bin
162a7fe4a68dc9fe70490c6212159a2b3b0a813d5a13e16aa087bb3012ab1647
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 16800 bytes
font_01_sfnt_off000118f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 16792 bytes
font_02_sfnt_off0001310e.bin
add28368649d189ba53c37d7ac7dfaf9c8bfcf808d4b3e9e50bb8029c59c7936
pdf-font-stream PDF embedded font (sfnt) at offset 0x1310E 10500 bytes