Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc91ff89e368867c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 09:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f364be4618e49af9175bb891ac7c940b SHA-1: 0e8a012652fc0382f714846321af99a1ece35b26 SHA-256: bc91ff89e368867c720bed4d01fbacd2f4547a0210f686ca617a7c3b92d73c79
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing lures. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=war+storm+read+online+free PDF link annotation
    • https://ost-fogging.com/upload/files/28923743608.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/wiwedufigulax.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/zizosabanokajopumado.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/10526279174.pdfIn PDF document text
    • http://ed-union05.ru/files/file/78134713590.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a39e2c8a3c13db6474c0c0e9f327ba3d/31783616654.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24888888492.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/41265718304.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/mewizulorunetod.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4ee1484090480f6c4bd2001cb69e7e8e/zalofarozuzokokap.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/kuxalu.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/rovopumerubanusotujuri.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/01/jufagomafowapowukaf.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ce264fd1c3a4287b9e9e354fb975ddcd/kewitepex.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/81567043016.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/pixureku.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/08d1679b79a839719f09dccced8877fe/luxamumadiwobama.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/nimuxuve.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac83fbb436---8598012446.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lmp0o4cjr2j5ne3deub0biuhl1/23121103925.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c56e050a---wenasiligisalaguzemawuse.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/dokajonimakiponewore.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/diwajijeguzemivinibogi.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/xagin.pdfIn PDF document text
    • 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_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 10508 bytes
SHA-256: 91d4329efe158278eb7f580e4c2396aa84c67bc7970ac836b0ffc6321e749d39
font_02_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 17744 bytes
SHA-256: 309e8bd2fd87c201026dd15d056c80e784b20fa710c7f9d844d4e668b2410b64

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