Malicious PDF — malware analysis report

Static analysis result for SHA-256 d199134ca89e4ef9…

MALICIOUS

PDF

89.7 KB Created: 2021-09-03 20:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00012d06007b35991c13bcfef2f31758 SHA-1: 817f41ed475ad3278880a6c5e72703cb406fa1e5 SHA-256: d199134ca89e4ef9b705d4fcae38db8fb6d5dda66d100c5bc28b777614142308
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to potentially compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7799392f---kurenelibudijenu.pdf In PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/rinupomokiserugonitisurop.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/fupejiso.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae5b6d73e---16697525331.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/wadexuwazod.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e46c5cfe41999078f3af477ba86dd880/28272650358.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/mixukula.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/51976749522.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/91812292397.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607456e6d893a---jonitulimawu.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/93573472035.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/piwudilo.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/23824958605.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/zubamedowononiwekiwede.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6686e7551a---18522116351.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25979680c---99837110439.pdfIn PDF document text
    • https://edusfera.pl/upload/file/rutasidugumefa.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/fojasevivila.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a1d57faf0---lematerowelodovunixusa.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rkpgvvgjitk7jb73ap3gpoo0o4/bikabegisufore.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/7206334522.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/xodubuvozepolomo.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/wazudakexumimabarid.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9dc27266de98ce470d44a30f00483d97/38519122109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sithargal+ragasiyam+in+tamil+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 23908 bytes
SHA-256: 0725a5714c0a937f8317854c519adef56e1131685ae23f7035a20449f4b34274
font_01_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 16436 bytes
SHA-256: f469cf245d400796e2bcc8f1185677287d8f05a867041e660a3c131ea27e8dca
font_02_sfnt_off00012804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001401b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401B 10880 bytes
SHA-256: 1a2cf244392303b0bdcd551c07e915e03eba1e1eff066e879ac263540195f393

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