Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec473fe429dabe86…

MALICIOUS

PDF

91.6 KB Created: 2021-07-12 22:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1674f483363f935e693c619d84730e8f SHA-1: fc042e12f1b05e77e5e26b2dbca37fe3b71bb84f SHA-256: ec473fe429dabe86c4c70bcd2138994aa7bc62588be7096e501414e6a6a22ebd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially malicious websites. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://oniceh.ru/uplcv?utm_term=best+old+song+ringtone
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/c4e05d6009a2b8f8c4b88f884e5896f6/moselotidepubagudetoro.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c05ebf71827---bonafum.pdf
    • http://aimic.com/userfiles/file/1860834610.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeac963ab9---85915309541.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/pegakusulolorujisitoxidux.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d99889b68---69698891703.pdf
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/65979545818.pdf
    • http://islandpointfl.com/userimages/82972314661.pdf
    • https://ceral.pl/ceral/pliki/file/dipidowuruduba.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6c386f0ccad0ceb5adb59c7ba3de12db/posavudateki.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/63825191419.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9f2769ff15e7833196b45a2a0593f61d/fubalafiwilolo.pdf
    • http://aquatrustfina.com/userfiles/file/562316469.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf53172792---62884337596.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160867ea8ac1b9---98470198510.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f56221d69---rojipijifuwis.pdf
    • http://farashimirooz.com/files/lozinonev.pdf
    • https://dagvandearchitectuur.be/_files/file/lenitiruburaxemivalu.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c923a476d18fdab7140786f2564c6135/fifuzix.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160df7d09aa55b---ribezokegabodam.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f413b2a154---sedizofitiruvovomujal.pdf
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/10379877569.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1942e80f5f2f2ca99e76fc8b65734546/topatisatotupazixodo.pdf
    • 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_off000105d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 16792 bytes
font_01_sfnt_off00011deb.bin
d67338f647dfa8a983bd882044138b3204b928fa29c883c07cde83bda6509a2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEB 10312 bytes
font_02_sfnt_off0001350d.bin
bb6cb7d3fb34f7a6b13aff59794bf10e7e35078b284f3623cc8853386a4183da
pdf-font-stream PDF embedded font (sfnt) at offset 0x1350D 17032 bytes