Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fd16cad4ecf4ff…

MALICIOUS

PDF

116.5 KB Created: 2021-07-02 05:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9c64605184f708717065f484f0b3f4f0 SHA-1: ac0fa057661b59eb3c7ef29450ac42e28cdf687e SHA-256: 73fd16cad4ecf4ff658c9ecfea80191bd365673525977b6adb48b07b8c8ef527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to websites hosted on compromised WordPress installations or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/mimesekusumu.pdf In PDF document text
    • http://allamericannursing.com/userfiles/file/31023802654.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30ccd059b9---67347842057.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/biburedoru.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4f96eb100bf9958aedae8ed1b2b8776/lomifiroriv.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/u5jnit541sppnhu85ep5lerf1l/72023529843.pdfIn PDF document text
    • https://stopserv.ru/files/file/samaxesevus.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609157cbd1bc2---92848034335.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/18688a730ea60334e2e61593d9843d8a/74261633555.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/vipedulobutorejuw.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c266c1a40d---dubeturirazexovagoge.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d5159ff73---temibijirolatarawusuditul.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/08d0b90b0398ed6034c570751ae73305/rixudojiwawof.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/jewix.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7350b8159---fomofamolosifedexegu.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/usrg65dbdctu7t6a02d9sve536/92506959339.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099c740863d2---27232132951.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/18825732311.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dijovoxamifu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a205befae---13695146023.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/newazapitazamifavila.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40f86d7e85---314303943.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a61c8d67f12---42979742726.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5679bdd2e---71975409983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=feedback+tamil+meaningPDF 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_off00015ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECE 10532 bytes
SHA-256: b83949c58e9510151ef7acf5a4408f56484a978ae3e6e8c67c0954ddf878bb49
font_01_sfnt_off0001767f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1767F 20360 bytes
SHA-256: 1a0d91dac45f5006a049b840b444b9f7e5a3240ab6860fac8b6616fec2f2bc6c
font_02_sfnt_off0001ab7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1