Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0b98ef394bcef4…

MALICIOUS

PDF

91.2 KB Created: 2021-07-07 19:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b19300c7b1794a70de6779ba6dbc584f SHA-1: e3980668ec96b00eca2fc15fe0a7618a0e0a78c1 SHA-256: fc0b98ef394bcef425100416c6ecb46f29da72413fcdc7bbbf243293f6b3a190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external resources, including those hosted on compromised WordPress sites. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2406ba30b6---62925692937.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab51e758a9---vutimaxisuma.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/05/80885556147.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3a367ff7d---tutinogapituk.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/powaw.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/h84gl5jou6e5qt8aba06mdiqh1/35039438672.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/29633203127.pdfIn PDF document text
    • http://garderoba.sk/images/_file/624258122.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/duxixaxadaluwarezefufede.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c1162055b---23039434043.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1dff903aa---juwatitizunopabujapip.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b2f6a48ae9e05d6cd96402840fcfc399/29699214606.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9a785327f---nexotamokigobedupiwerilur.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c116692d055---7960220927.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/aea2f6f0863f136af5755f0b3f0dc197/favelinibojuked.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60b985e29---36486727092.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/36899938243.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2de5cf23c944fa1e6c228708d32b64e8/61267784420.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac196dcfae0---18080966796.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/nidikimabuzesu.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/1vu0tmngqb6at5iuoqlu34e30t/9654628965.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/73865770962.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c95afb072ad5d653a7698c99fcc0f95f/11896128312.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/kapekilomunirulow.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/kilidati.pdfIn PDF document text
    • http://synowka.pl/galeria/file/gififavajulis.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/dea7fe68ca2a5dd63b18f3ace97dbd16/rolopewusikuzemu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f41bf06c6---rufabogeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=paresthesia+signs+and+symptomsPDF 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_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 10908 bytes
SHA-256: 47da4735f0656a7355954d6ccc3c36ff108a2b7dad21039f2f940ba7719cfe60
font_02_sfnt_off000132fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FB 16964 bytes
SHA-256: dfd210d4884b269085f3f42c45a57ae65f46a6d221f9f65405463ec813f16869

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