Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25de48f719bec99…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 00:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4993f1bc27492ff2cba7f7f71939503d SHA-1: 0ddd17892ca496907c60a3e2a0beb6a4570192d5 SHA-256: d25de48f719bec99208260d87d49d77c83463d6a129a7365b1c4ea92e25caeb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were directly extracted, the PDF structure and link farm heuristics indicate an attempt to lead users to malicious external sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://areicon.com/images/file/wikusu.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/89940634019.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/bp2fc598so0uvp03ugl4tgati6/89898443176.pdf
    • https://myphambambi.com/webroot/img/files/mekanuruxil.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/86154871562.pdf
    • https://laserbeautymachine.net/d/files/rekax.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/29dd0830f581adc2a201f87f419e0cde/zenataluganani.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/264184a2b6bc6b5bc66aa245b11443df/62278295654.pdf
    • http://itkaufmann.com/images/fckimages/file/9312027440.pdf
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/52924793142.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b68586ced---42735289658.pdf
    • http://longchimvac.net/app/webroot/uploads/files/ziforufujode.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d893320f44---refulupedonuzawutiwiva.pdf
    • https://altinhediyeler.com/calisma2/files/uploads/sasavolononogaxuviko.pdf
    • https://gulf-rope.com/images/bulk_images/files/zakatoromo.pdf
    • https://bocrangsuthammy.vn/upload/files/20384479489.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f114c9041c---betajom.pdf
    • http://supermarketdv.ru/files/file/xavosunedamuboretasonu.pdf
    • https://jotekonybakterium.hu/userfiles/files/72767025689.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sbmbilhu6ha8io8h3ustkhp843/nejesunovutamob.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fdb441568---rinosuwuxilenelabelukuver.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21285942880.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/lumuzixigaxaf.pdf
    • http://www.moyekolodin.com/files/64475954004.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/12945807496.pdf
    • https://glaskunstcentrum.nl/images/file/ritijibuwevaxudasifaw.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03009e71c---kabezokipimebuvekexa.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cf379751e---33241467898.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=converting+percentages+to+fractions+worksheet+tes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba7.bin
2c10d513eb850a2728b98e1e4279cc96074305450e2b4d83a33b1258ce017219
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 10988 bytes
font_01_sfnt_off0000f548.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 16792 bytes
font_02_sfnt_off00010d5a.bin
01b97427db6e9816e8f01d6878d693fbbbee5222f63f74c8f2d9fbb53e558d70
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 18464 bytes