Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a89ffb19d9d2c84…

MALICIOUS

PDF

71.1 KB Created: 2021-09-02 20:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3118134cd8a71a947697846a71c3ae0e SHA-1: 9fc9bda087f20de805d5aa52bff1af0fe61946a3 SHA-256: 6a89ffb19d9d2c843343a4df57640013213ff4d621a89cd770bd21d51cb8c66e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing attack, potentially leveraging embedded JavaScript for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070c4b3a63e5---96837385508.pdf In PDF document text
    • http://novafish.it/userfiles/files/15215054284.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a504390e407---71012112941.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c04fc604f---11941663348.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/33088883942.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/kapojiwibututojinepip.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/32519dc1b7a7ac73a64fd1bfdb0d08ca/7836795748.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eaebb2bfb---rorizudufudetujep.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608801a078c83---bupagarazesoxevalorigere.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/taniwuxikefofoxijis.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1b140d252b7c2079cd643997c8ccf846/38420788704.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/28313136988.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/3494940658.pdfIn PDF document text
    • http://foodchemsino.com/d/files/wilevi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff058dafb5---negivopujedazok.pdfIn PDF document text
    • http://klinok-saintp.ru/files/fexodegutaz.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609000d670f30---vifidotosuliwaf.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/vavirifame.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/68774376072.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986aaa704b9---wesodiditazupefejewojusom.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/2471804690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=simatic+s7-300+pdf+espa%C3%B1olPDF 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_off0000b2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EB 11236 bytes
SHA-256: 5fb0706c80151b98da6f8196ace7feb63108d0c455d8587b8337144bd70de080
font_01_sfnt_off0000cd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 15664 bytes
SHA-256: d9dc0fb96af92dd502fdea38a3287e1662f8198459015adc54b8ff25444dc077
font_02_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1