Malicious PDF — malware analysis report

Static analysis result for SHA-256 8865b72236cbe164…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 02:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33db0699f0f8f0d8325d4744e76e95fe SHA-1: 5520fdb06131cfccbc633ce420312778d43f959c SHA-256: 8865b72236cbe164e93fdf443432728c25e50e1e17883ce883ce8682af2d0f70
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm that points to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The primary goal appears to be directing users to external resources, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074af88b0a50---19019495702.pdf In PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/naluwubibiwovunu.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210812_144651.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/95541683222.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084361a8c6a8---52217885594.pdfIn PDF document text
    • http://waterreducer.cn/d/files/32993456483.pdfIn PDF document text
    • https://orangerun.re/photo/files/zuwegisopuve.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/12417338176.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612be5df070ba---sagovogefiwolane.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1c67bb7412ee18764535f848ec47e5de/kugokuwewozup.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/56924541116.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5270ba646---96793790190.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/af12d9b68af515d8852270b2c7828438/vazisivutadubifukenapowe.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/xevef.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/4hiq8ks6l69qsqalknmfm51psf/71587511099.pdfIn PDF document text
    • http://hkalc.com/userfiles/vusadulenetifovepi.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/83483839694.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/bidawajixotugumutup.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/bomadokumaz.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/3e609d12758966f3ca2f2fbd1cd0b73e/57284105958.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/teduxemuvutiwu.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/25053765244.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/73093596206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pharmaceutical+jurisprudence+sp+agarwal+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_off0000b2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B6 11264 bytes
SHA-256: b75b6d9bc8e6172d6dadda172bb47d27b51e2f994efeeb732ea8efbe78188b2c
font_01_sfnt_off0000ccc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 16080 bytes
SHA-256: dcd4d82b94c6a6d5af001391e30f4e63c962be74d9591aee6594aa46d716e387
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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