Malicious PDF — malware analysis report

Static analysis result for SHA-256 85026a0021e20de6…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 05:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97d7f20a806a8be97b91940ea578763e SHA-1: 88456e6d653441647bea3b0fdaf53c52bb2b9d2a SHA-256: 85026a0021e20de6c020f719c9f06c1ab869ae2d3e235794960b65606528fe83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely serving as a lure for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://auto826.com/uploads/files/25432017017.pdf In PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/87vjrcj8guob0uftg5c8e5u08a/luzas.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/531707398.pdfIn PDF document text
    • http://jainfarms.com/uploads/biposodanogupogodoxol.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/jijeberuxuriletizeji.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161009627150d0---83986012355.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/4384213569.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/kogedelarurad.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/85252741180.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19093d3b7---dumoluxupo.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/j4dvp3ritqvd9k463e770k2a10/43543695423.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a32542a3432---vizodi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d7f0351a---23625606470.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/31573348495.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/14970072114.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/84899406675.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062414202270.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/gixotowiwe.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/pagunolixakene.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161086d85d6dbb---50743649656.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a38ca48a7---25634245251.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/vedujuxabaridududomozotu.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/48001467144.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dacf612120f---4349747253.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20ff962827---97475295536.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/51993094284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=adobe+pdf+packagesPDF 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_off0000bd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 10568 bytes
SHA-256: 943bc9c9d175c6fd02d8263335fe4d3342cffbec8d82147720e52817277919c4
font_02_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 14928 bytes
SHA-256: bf474072d796669d505962e7a13f400a24f681dec913c9f7ffd32abc6e014a97

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