Malicious PDF — malware analysis report

Static analysis result for SHA-256 404a0217f89b9edd…

MALICIOUS

PDF

138.6 KB Created: 2021-08-30 09:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c59319dab6162397c3afdcd46ad19096 SHA-1: 294354a86e34f61710268d6af18fdb2daa71ffb0 SHA-256: 404a0217f89b9edd35aca80b4e1fecd491f1e9a6037ad24d50f64dc4b7848a9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, directing users to multiple external URLs hosted on compromised CMS uploads, suggesting an attempt to distribute phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • 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
  • 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://statewideroadservices.com/clients/879378/File/piwuxera.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749b4f5c484---95617786514.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/59693149799.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3bcef4bf5763aabd22ccc799a49e08b0/vepilituriligarafowulet.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/begetuzojipidajuted.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4vm50pijj5qf2u0g36302iff01/18997212888.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ac7390f26---zemenekedofizaworivari.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/guvovanuvozefavaxirogof.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bef1f9edea8---76642816970.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/71820279893.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/23085979644.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/biobqqi98lehd3qq3r5aqf38jq/zigerawakela.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/uu7q0u25q8kvcjjal1akvchmpt/jixupotiwegoj.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/kemajidagitejemolopovup.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16110e6a27d340---nipelos.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/33398422823.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/potamawobo.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/gefugununijasiwa.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ce38c72e7---mekekufi.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/18542152665.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/88196079915.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2io3ld2i7h62it51lqlo6gaua4/fisunu.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/knek6r5ri1uhdtdafdq9f3b5rb/dovitifamedunetinuturifo.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/vetijifodufobemoladi.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/sizojawobegowopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=adjust+front+caliper+brakes+bicyclePDF link annotation
    • 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_off0001b447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B447 20280 bytes
SHA-256: f11fa4089affcead53b4ce2f62f98ee1f8b234958f290803cf8df73f4bc835bc
font_01_sfnt_off0001e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E993 11168 bytes
SHA-256: f729fb454bcca387ee697f962f5539a4c077bfbbff994ea544dcb344867b4113
font_02_sfnt_off0002039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2039E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1