Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dc9cc55be8fb2d…

MALICIOUS

PDF

84.4 KB Created: 2021-07-02 12:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aa0d98d27ca32e16c1ddc72c91fe1cae SHA-1: 35cf9b7138bd5d038e40279c7569af830f4a3a0f SHA-256: 39dc9cc55be8fb2d0cd3b2af1e8bafdeba05a090d8fbae1adaf8321980f9754e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://xn--80aamdqpfpr.xn--p1ai/upload_picture/29406366777.pdf In PDF document text
    • https://aashianarealty.com/file/69271492994.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a358ce85df---81800445117.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0c2f7f2c4d91a601d306948924c1a7ff/8037086130.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//jaxasifavapebipareza.pdfIn PDF document text
    • http://c-six.it/userfiles/files/26477201827.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609efa5f08476---lexororedesibi.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/9297299889.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/01b7de3954d8f6b3438bda2678af7c60/97653365545.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9d10e9b9ad9a8bbf04da072788498be0/lobafifugusut.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160760be32c750---samoberiwojif.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2kim325u9p50jctqfq9gqaqj6/liwapalutusulu.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/64567378078.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/47103373433.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/didez.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12cd0e403c---lepafizalonedasod.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210605_751B19F04B27D150.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e753c6c75c26e2cf2647d2b76cdc1bf8/40080167109.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/opukedjmeojts0m5lgkkulr1af/90385873991.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/8c3icd89kptt12h4hqtuppvul3/26682379457.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2cdb74831f3e294a21718b48b3b936b4/zuwifetemizanatujizuvi.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bimuwodegebumas.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/49280751149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mumble+microphone+not+workingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 10900 bytes
SHA-256: df15bce5af0b98af60122592ac6f0881a91ffae95e4ce4df8adcb4430e8935bf
font_01_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 17152 bytes
SHA-256: 651a0ad296de2a4acf9f8c27e4a5507f502e6b4f2df25c198918d32ea0b1899d
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 16304 bytes
SHA-256: 941f9f9fcefaf6a4a29a9d435c20b3969e4a0a156cc9bc38e659e50b09bc9075
font_03_sfnt_off00012bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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