Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8b518ef20c95ea…

MALICIOUS

PDF

86.1 KB Created: 2021-08-25 20:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f58801ccb469e80e03f711f7fc0bda52 SHA-1: 1f3b35ea85ab052a5a1d885a477f9388eac1121b SHA-256: 0c8b518ef20c95ea246fe60fb7f39f21495e0bfbcb1eff16282d328ee212b229
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised WordPress uploads and disposable domains, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics strongly indicate malicious intent through link farming and external URI redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://queure.ru/uplcv?utm_term=green+mold+in+water PDF link annotation
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/d8e616t5id3k048rse5tf4bsii/24335360945.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/xikeson.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/fomenolunalivirijab.pdfIn PDF document text
    • http://semanbio.com/upload/files/kozipobusojalozare.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/18202318611.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b065b21491e---nesevotibuxugaxekigefove.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/95610483122.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdce553f4c8---60081398477.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/zifan.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/61034893178.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/risaxawulabadoga.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a39e738b98ce091036f10481fa4b4187/94173588907.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210504122113.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/akrtd7ilbm0pfitfs3o3mg5at0/luwinitumodu.pdfIn PDF document text
    • http://goldia.cz/data/file/pekimu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b368b1d43---9465172527.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_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 10368 bytes
SHA-256: d05507a94ec61d932f3bcb47c2575e45954cc2b2ded1bf3851e0bf51da958733
font_01_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 17232 bytes
SHA-256: a49aacdc213371668565032a40ee309ef14b5b0564c70349e22d105259466aba

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