Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbcca668ad28fef…

MALICIOUS

PDF

89.6 KB Created: 2021-09-09 07:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5fa86341d5be327a21755f21570c0735 SHA-1: 81b4c37f472f44998dc1296fa00041f86089eeca SHA-256: 4bbcca668ad28fef51032345010ba4e4e4435cd08219d99aec9009fadc103796
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vsetinrally.cz/userfiles/file/suzofuzulanomonetapojapu.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d10360fe4---45333430521.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uguqaqf47f8kc3c4qs4r8ulvum/41136573063.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/xojoxigem.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/34219504701.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/nixotijiponemupad.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/36864081448.pdfIn PDF document text
    • http://hasyo.net/files/file/40791900588.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/47756644299.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/88639035515.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/11714911725.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/vanofebugazu.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/kepafegumunukapapal.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/feludoferuned.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/he83qc9h3gj7s2o77qnpnkcs41/mezenexu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/46944522480.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/momev.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/77282298007.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/bitomim.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/nuvixelowukimi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613302f075aa6---44467059483.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/81946961460.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/runaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=example+of+transaction+processing+system+in+supermarketPDF 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_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 11212 bytes
SHA-256: 0a138816a23adc8cf6e9123a3127ebf8fdf6fa9dc64d9685eee454088b33a1cf
font_01_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12955 18048 bytes
SHA-256: da81fa95b1d17ad37d156574d0aa10a137655b5bfac03fe5e00c293b06f46004

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