Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a42ac3878db10fd…

MALICIOUS

PDF

76.4 KB Created: 2021-07-04 01:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbec4c8ef3fd7fbb7a3f8d6cfcc9c939 SHA-1: 7b4ef7424ed057d26f17d99f4f61171bc0361dab SHA-256: 5a42ac3878db10fd2ad5a937e945550913953146371051cde9a30a6b24fee87b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing the 'formcraft' plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e4af35593---15286383565.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/45aef94fa15748c2b9b62a748453749b/wubewinofabaveledola.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca6c72039---rixuvorinotewatomaluni.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16097c01a831d5---78572328716.pdf
    • http://armanetti.com/images/nuremofoxek.pdf
    • https://caribemed.com/userfiles/file/1105934726.pdf
    • http://tscyw.net/userfiles/file/20210612060107_wvtw8s.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/88339ca5f7e4b5b3d3756c9b84e58dc6/tutiteramijikudixojozomet.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/62b67268d659ccf2c98a6ce07b09124b/kibax.pdf
    • https://europartner2.pl/uploads/21490429000.pdf
    • http://altaprecision.com/userfiles/file/nutiwi.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4470f7eec0---31843095110.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/2336c84c209dae16692d9670be991bf0/20886177616.pdf
    • http://sapaethnic.com/webroot/img/files/tikewuxipotodotovogebik.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf70717ac94---wudivonotupop.pdf
    • http://gesundimjob.at/images/content/files/6594743040.pdf
    • http://joewhitefamilysite.com/clients/59967/File/nawipuf.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b847cc52158---36705591494.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/4833cc5e1b2717faffc0d84aeeeeb3e5/jazuzekufos.pdf
    • http://rwdwebwebdesign.com/img-aim/files/dogisikawuva.pdf
    • http://altaprecision.com/userfiles/file/gijanad.pdf
    • http://analogsys.com/uploaded/file/104919427960a2c7d1e7f07.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82b385e2d---muziduximuveri.pdf
    • http://jarosi.hu/files/file/xikomobage.pdf
    • http://szentimresiklos.hu/upload/file/piboge.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+difference+between+centroid+and+orthocenter
    • 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_off0000c803.bin
b638477f33230db43dc2bdd3421a9e105345c14c5b296568bd2d983316bfc2ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xC803 10744 bytes
font_01_sfnt_off0000e0b9.bin
d2ad260c2ce32f05776f9eae3e5cb1033d819b42d5bc0a3dd72cddb7e0e8fb14
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 16960 bytes
font_02_sfnt_off00010bbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 16792 bytes