Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74f5c6ab7687bbe…

MALICIOUS

PDF

128.5 KB Created: 2021-08-02 13:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b7556b8ec303ea92a92c3cc5c7841af9 SHA-1: bc4037d8af1d1db80b2f2a532c147a4b9c3d3335 SHA-256: a74f5c6ab7687bbe68ff4099e61b9cdc370dc89208c6f86db88cebdf8ed6ea44
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/226f9792536518b1f0b716760a020b23/nivaranevikupamorix.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/63bb9deffbcb4e6e25ac7c5ec4dec758/15950917983.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607835af505f9---lelefe.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9e1993d9---10593951787.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/tapolijugogowufelojiropo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nfimdnuffcd922dgv829lji887/jowebipiwagunipolalazizuw.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160730dd93632c---voraseligugapukopiga.pdfIn PDF document text
    • http://metallpress.ru/files/2986085397.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5639cac85---79557504408.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/11199037324.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/53853975495.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/narejuw.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/duvufadewe.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/52688078853.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/84399639464.pdfIn PDF document text
    • https://citytrafik.nu/images/file/zajirirogeku.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fa4ee6f52---bifakos.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ea65c426b31322d42198d3e9955b02ae/40200747682.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4780067a16abe7c84e461e61feb03b2b/mexot.pdfIn PDF document text
    • https://slide-bearing.com/d/files/jexaraziromig.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/837deee0a3f4622d2d983057b9ebb9f3/22010950343.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f10ebec35d87bfb1c9be9d3c1fb959b1/24462759857.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/16406926176.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/ponevovikavo.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/170931388147.pdfIn PDF document text
    • http://didaconcept.com/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=uefa+champions+league+2020+calendarPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19423 28800 bytes
SHA-256: edd1b2671e2ad40830ef9839c9367d6213f2f7ae595b4326934e9df6d3d65913
font_02_sfnt_off0001d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D87C 11316 bytes
SHA-256: 7577bbce3e329bf13d3dd2bab3838f9b487bb77ac089166a2bca018902e6c6f2

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