Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6115c2d9c06c05…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 03:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf24ec7f61602ef39ff21cbf7a2b3153 SHA-1: 04802dd1162157fca6b50dd7b5a45321bf9480d5 SHA-256: cb6115c2d9c06c0594a37ae38d95f41fc048515f20cb7ed04231f4a3546e0b1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing campaigns that leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b1a3a0c6---37359164985.pdf In PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160902d526f3c5---70689444121.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ce6e707d6e74f8039fbee25abd590bb1/furome.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/47c7e6e3a66187599604d2efefdd5ea8/50244010784.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/67683168493.pdfIn PDF document text
    • https://ubranni.com/uploader/files/nofubaletajefugojazimile.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/ziwetejobajokazomov.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/42410260678.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607275f09ab60---ponososa.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jrn30rhhlkstl9b9bl8jna7sg2/83127462107.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd44de89c6---pegowub.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b3e6ded6893f3a71156bd638033d7f45/91930092270.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/47251077602.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8c0059c2e---59348128243.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3bf8edff37567870eea3eff80ba7bf3d/39799992913.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/16783759367.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/fikax.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/javojumokovafafuzaparef.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/42529223002.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64a17bc6cd---lixejogowixevefaku.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33554183686.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/70708819858.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fqjlnol2lq1jgpm9pa55c7vih7/zovukizugisuroganipep.pdfIn PDF document text
    • http://devison-matras.com/upload/file/18530637013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=holy+quran+with+bangla+pronunciation+pdfPDF 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_off0000bcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB4 11176 bytes
SHA-256: 84bcc5f7e2f57e511ea6c21676039807bd3d1b16b26ce7ae8a7e28eb6be9b978
font_01_sfnt_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 17204 bytes
SHA-256: 0451d4a52b9696bf0eaaf4113202fe133e007a304eb7e02e27f64fb408964e4e
font_02_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1