Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98bc52f8e40bfde…

MALICIOUS

PDF

74.1 KB Created: 2021-06-30 08:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ed93d35da264ac9a7b08f4c221f70734 SHA-1: d0299d6f4ae45cdcd09ee76ab21bdaca6107a139 SHA-256: c98bc52f8e40bfdeb6853ab1771e7fb660b9eb1e9b92782dd2a6fe40cf7383fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for malicious redirection. ClamAV and ML classifiers flagged the file as malicious, specifically as a phishing trojan. The presence of multiple PDF link farm heuristics further supports the conclusion that this document is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://precedent.by/_newsite/images_from_html_editor/file/lixovurul.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ha8ref49mhb31fv996imlv61n4/47095550830.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-27/images/files/monatomawibitukeg.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/i73n7hbtjhad229gb5hi8dp2a1/87879503217.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc51b56365---69666869893.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/gofaw.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab9a876a0---26691942360.pdfIn PDF document text
    • http://arablift.net/userfiles/file/59312094163.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/78661868982.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/73248844104.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/lolivax.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/452ffd55d84c4b944660729cd8dc5f3e/82038553411.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/64947407487.pdfIn PDF document text
    • https://carlojans.com/cms/file/boxipazajagasagebe.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f939697c80---muzubasoroxa.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f7c4f0ee4421aafa32251f40fbf23bf6/bumozibaj.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c47bc8f71---77273178271.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4c6dc08b---95025584587.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9c182a8bf40b7f90220dd3f8e74ced1f/zafoxasenamagurerukazoveb.pdfIn PDF document text
    • https://petala.gr/userfiles/file/jikuwopalujegilinorav.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609127ddd0081---jojisiwarusobikom.pdfIn PDF document text
    • http://df-foundry.net/d/files/rolikaxulinulewen.pdfIn PDF document text
    • http://bptramptour.pl/files/file/52661504463.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/m5m5l52ftiq8h2qdk47n1960or/97350274659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+many+jeremiah%27s+are+there+in+the+biblePDF 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_off0000c11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 15736 bytes
SHA-256: 39414ef441e283847c776bc9f0f929a34c0ce6b97dc07e54dbff19e0c84e7a82
font_02_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 10868 bytes
SHA-256: 681c580a042de4aad77c217ea87e87bd03cd9f5d38fa6410a40ffd7afa245fda

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