Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcba5c2b5570793f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 07:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: acb37b06b4d9cb733ce27601a182ddf3 SHA-1: d2460b6faa4f26e3ee5a130f5e05c799eca2457c SHA-256: bcba5c2b5570793fec2232b6506dd53ac53c6031b3a2d8f3f451533020514977
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to various websites, many of which are hosted on compromised CMS uploads or disposable domains, under the guise of a PDF conversion tool. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://crewmak.ru/uplcv?utm_term=convert+pdf+ke+word+yang+bagus PDF link annotation
    • http://legalinet.eu/userfiles/files/donob.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b49f125ff30---numexufelabiguma.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/tapazukomu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fq2ftupsea2lokdf6e0mv9sutt/10069677776.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160794ad129be5---zegewulolunaribafed.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/kavubikivulutaropo.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/7310229516.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/kisezirelupemagako.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e586cd1469---77722439391.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5k2j60bccmuftmi8oh7jrsl909/xipevaxijenozojak.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/48186386225.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/99041085036.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/mijejirakatisulo.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/pozimudimusudizikemapepax.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/wabekes.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rtkov82arev5akkem1ljcjtg3v/78457204987.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa704cf09---49919290451.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-02/images/files/jefujitivakesilazalobu.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/sazozujamoreluremaxogor.pdfIn PDF document text
    • http://mlight.cz/archiv/file/73072025012.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/kovigugixoje.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_off0000c0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F3 17104 bytes
SHA-256: 256e278a2eee31d02e01895e78bc7c1d562f0e8ac4dd304de8e85ebc55ced604
font_01_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 11164 bytes
SHA-256: 98555ec08e0f92b8627aa3dc6bf5f4ac4b675bae5c0b07028faf863fa5405fe8

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