Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c7ad662be6a9a5…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 03:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3098acd75b77644e41ed158deff54174 SHA-1: 5d0b134cdb2790b1e0d5ffcf4dd2a4447558efa3 SHA-256: 79c7ad662be6a9a5b0647f9f0bdbbe8890418ccdb9038c885954d856b7fec4d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=bring+out+the+best+in+you PDF link annotation
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/03e543d8fb42379f558ff164d1329e04/23914459142.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/983363a868201b0ef783d84798251d51/74574258123.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/87248512939.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/77755666567.pdfIn PDF document text
    • http://podarox.ru/public/files/bafexalavopefibog.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/xuzitob.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/jefudefebob.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a4e2845d---93786356437.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/tofisofulose.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/363d5c8108aabb0bd3310d8903187833/simirekipuvuserejera.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/padufesebobajibivuxewam.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/sewevobopidaroduzilevuso.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b83f5553e0f---dumixinujesapizaxizi.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/64ba5e49a0189d4dded5c5168760a472/zexazijiz.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/99625370073.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/dk80p0ia6d41ikmgjote5jcoup/topusiz.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/579eb0961bf147f09ca7cd49e5754222/43115828221.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/38ba62be64b2f2bbaad90c84345573ab/58573848847.pdfIn PDF document text
    • http://www.77ice.com/upload/files/temadajukaxafirofiborujud.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/aef44731ffbd46f111e5fc72d1d39551/labofata.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2ec5bb67c---duvopinela.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/16640993964.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_off0000c178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC178 10584 bytes
SHA-256: 68e8a2c235a6a8daf28495e18a1f3ac7d94b731c73d3485af9ce63d3ab45aa83
font_01_sfnt_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 16664 bytes
SHA-256: 4c98ddad708fa8b24b84b4c4e5d642a93b1e7f657168cca79f3610db2fb32d3d
font_02_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.