Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8371bee9ef5bd8f…

MALICIOUS

PDF

217.5 KB Created: 2021-07-04 23:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 354abb265e47022aca616cce16da439c SHA-1: 8a136a655fc3e9fef6af4d13d940c263e756927f SHA-256: f8371bee9ef5bd8f46f90ef7ad8c2fcee7c1e317ba1f17cf5cb0b041a28cfebe
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a link farm pointing to compromised WordPress upload storage suggests an attempt to trick users into downloading further malicious content. The document body is unreadable, but the heuristics indicate a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fiberglasssupplydepot.com/userfiles/file/45400239064.pdf In PDF document text
    • http://kasargod.net/uploads/file/23179361554.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/fobepib.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a779a6adda5---ronuzoguririrulemap.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/49dee6664370ea187c43be40d70b6590/2838223370.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38eecec5a0---nefidubebutawelukato.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822f290a264---3537240109.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/tudkfn75pvapm0igo9uhb4qn3k/21776771815.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/9a64913691c31f19fc4d95e1d2e4f5ce/digogorapujel.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6668a4568b---32381183253.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/lrc21dilo0g7161okojs332e30/79760743143.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/3334859381.pdfIn PDF document text
    • http://mlight.cz/archiv/file/wofav.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b891f174636---sujefonimes.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/85181e96172adaf88187e30fde11525a/21920714480.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/11vicihe0r5lkdunb7ctdofg73/lixinorovun.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2b918f2728bf2f8fbfbc961d500460ee/98052431595.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/48626256990.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/11270693988.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e77aamsg542v0e49tc2n1tose6/gozekikupenitujojaxurogod.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7674a766a369cabf7723dbeab937b571/25808504540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=chemistry+book+3+pdf+downloadPDF 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_off0002dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2D4 19464 bytes
SHA-256: f29207f24dfe1df11683b3de11d4b584d1c74842236f4e5d5cd8a1b13f2a9df6
font_02_sfnt_off00032631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32631 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off00033b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33B67 11400 bytes
SHA-256: 7ccb9dacf876551e3dd5374b35821b9a1204cf94dfd1624c47649ad04d9eb10d

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