Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3b87f3ced971e1…

MALICIOUS

PDF

82.4 KB Created: 2021-06-27 05:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1193c6a6b9c0fb48596496c82f9a8d0d SHA-1: d9e210a8ae94e182a60668d27947ba39b7a82365 SHA-256: bc3b87f3ced971e1535d7d0e6346fa73f3c6a4909584625be6583807ba4b5557
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://drivingschool-brno.eu/files/63439376382.pdf In PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/9fcadef500e01b1b44edcf406ca927ef/nepinikenuzepotaw.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/b6e0203c9210426b0820ced6009625b5/rozezekedisaworamariwiwas.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8113eeb14---gegamajudobakateserasuwab.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608625cb600ff---pazanuxem.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106191038416709.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160922f709705b---12374882658.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/18563549197.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b7b263866---41695398728.pdfIn PDF document text
    • https://inifd.london/uploads/file/67005172680.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/54410969667.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e8585763---gapabefanur.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/xizixifujakidixowuw.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc23f5df80d---dukolasajajoze.pdfIn PDF document text
    • http://fullx.net/files/82233980857.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/42173060087.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/84622217038.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/98902307778.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/50465812001.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/19691645923.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd45ac2b9e6---7725187184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=skin+in+the+game+pdf+free+downloadPDF 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_off0000dccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 17612 bytes
SHA-256: a09461d899d45a4bf777b0478ee800bddc733129a5f4deacbfbdc4c971a3aa08
font_02_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 11028 bytes
SHA-256: 5421c413b1b29c84814834e352b7fc680f8f7a2f94f50223269ebce1c0809621

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