Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c90fbe9925c91c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-07 19:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: baad4441c7d5eb60c4b9484771b372bb SHA-1: 39bbc07e65bc9d37469a1763445cdece1f08d327 SHA-256: 78c90fbe9925c91cf51e02bb645dd79095739da8eb2eecd11184f6e8d0070c4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on disposable hosting and compromised CMS uploads reinforces the nature of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092008bd591e---fedikakuveto.pdf In PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137553adccb9---kezegasowuredadikuwet.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c87df03d8b1337a315746095dca004fb/xaguvafoxar.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/78755883040.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/83453180143.pdfIn PDF document text
    • http://health-bridge.in/upload/file/68930786927.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/basamovudopowun.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/87037186301.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/81430740921.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081354a276f9---88803104387.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/47099838238.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/werezetodujomejaxotu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/fqm54jbtjjhq4vqfbtk021u9b7/xenejudu.pdfIn PDF document text
    • https://wagaskar.com/media/wofinat.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/folegawagepas.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/25935567677.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/58207a369584bea1f9eb93f54d0edeeb/25212868039.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/82efaea3ae15bfbe52c2fff7d8a0c30c/99090127540.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xunokaxesip.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/19903486119.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/62467edc6bb113315364f6cd8f10754b/68781879770.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158906689d---pezanoderagab.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/85176810324.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ud1e124c2nmrll6aajrsk0s93f/dovidakonojilavol.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/kibebodozigupagepo.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/sogozok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=spanish+subjunctive+practice+worksheets+freePDF 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_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 18980 bytes
SHA-256: ba2dbea3005829f00a4847cc5d0bf282a1d5e47e2ab586d3a0b2bb060a466701
font_01_sfnt_off000120d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EA 11220 bytes
SHA-256: b25a99e1a3a165a2ec6addc0173e47f4df80428ef9d93c4cbad32bc5a317a0f2

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