Malicious PDF — malware analysis report

Static analysis result for SHA-256 850664200dfe91e0…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 06:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 16add5da808ee33dd4fef3c526751eaf SHA-1: 854ae7e4e8ffe6c62f046c79b36553d5d533d35b SHA-256: 850664200dfe91e00eeedf0c0aa96bc2e7e2cc5dc87dd6f6dd86cb4497fa90af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and IP addresses, suggesting it functions as a link farm to distribute phishing content or further malware. The heuristic firings confirm the presence of multiple external URIs and a link farm structure on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=best+graphics+card+for+after+effects+2020 PDF link annotation
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d646466b4---xerezen.pdfPDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4b88648f1d1e7d84968e3330d40aa961/tepikosarasinut.pdfIn PDF document text
    • http://72.47.203.72/admin/common/ckfinder/userfiles/File/96234854328.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/ratofu.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/fibixejavobumopedatufe.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4b940b681cef245572ff3611fa06e8ab/jejusobefiwewufukemila.pdfIn PDF document text
    • http://russia-ex.com/34645405693.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa55f06fa---pomusunirud.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccde407485---gujilesiderinadivelakixop.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/9736880105.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/fab7e1b6f306026ea2922aaef056b8a0/dezetup.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/li8kt6amtr3du7hf3eed62dfu5/53632443791.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/fetosomiboxazapeluti.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/31357487532.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/15223424037.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/zagigekizafosasifadede.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160706ce5ddd35---fivulitejikukumirodupe.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/58569889626.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d807b3a6---tadoxesulo.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608424b2d84f4---fidizatajurov.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/23073842195.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/65843745453.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/05963e6d61f0ea3f4501e8fa72cf0198/15855201456.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/26329615469.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/m4fv1n43uu925s97ri4pbc3m12/davofozomokebep.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/mutipuzivivovipoj.pdfIn PDF document text
    • 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_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 17824 bytes
SHA-256: 6dfb8b01723ab99185239c0960768e91be4d927c8d17ec7dfac25fc644fc37ac
font_01_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13482 11044 bytes
SHA-256: 0967abdaa1d3770cc90df0cd974854c8aa007f99597601de639a9ff4a4d8760a

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