Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc2d2de5c7364c4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 00:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9565c11a0962981b9200732f5cabd06b SHA-1: fbcf5fbee1dbcc6be91900f2fc2c10ad124ab137 SHA-256: 4bc2d2de5c7364c440077ae9763a8b32add8229a3ff191fe16dcf947fad7603f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to direct users to potentially malicious content, aligning with phishing or malware distribution tactics. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.pharmawell.eu/ckfinder/userfiles/files/fomefu.pdf In PDF document text
    • http://bellina.pl/userfiles/file/budidig.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/78974569348.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/27493090433.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0bd1c90e0---52660643821.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/82767601390.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/dusiga.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/19823704043.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/32100119908.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/17834222208.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/70378424434.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/golimopudepemexo.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/342c562b522be34e8c6575435d6a10d3/46551102361.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/27626716126.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1kv77rf58c8mvnu49gt80nkp96/1247799889.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/57803554334.pdfIn PDF document text
    • http://whatdwellswithin.com/file/88381795121.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089b82935ae7---jabul.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b34bc3211df---mupetiwuvuxebiloworojob.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e25870386ab---fosax.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/67589028766.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b2950a849---32268248076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=antarctic+peninsula+map+pdfPDF 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_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 18828 bytes
SHA-256: 8e9f08911915c1e18304b825b9264178dfb102c809396f0f162559780cd081fe
font_01_sfnt_off00010720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10720 10740 bytes
SHA-256: 48fc6334960818b1fea302a514336e60d3ebf10c5bdae3514be7794754d87dab
font_02_sfnt_off00011fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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