Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9e199506aa32c9…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 17:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7f3ebe7b457c40accb7d5a4b883ea72 SHA-1: b058bc086180b5f9d10a3147e12f09807c32749a SHA-256: 8d9e199506aa32c949751c512fdbe25f2830357df18d93e7d1c1ddac06d620cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is a PDF document that contains a lure to execute commands via the clipboard, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. The document also hosts numerous links to other PDF files on compromised websites, suggesting it is part of a larger phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9278d7f1fcbcb64739c57dcf053310e3/feguninuz.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ma0abit5abo9h4cn99s4gfsm90/sisixoj.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/34891222557.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5bd92eb3e---ronikemiwev.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rumk2rjrsqbgm9r5v52rm9tok5/26488801912.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ca79913bcea---80114943613.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uecr53dt23co4huohbpi6rth9f/fivepiwibivevipe.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/51968e30adeed734336a3668f61bf535/gewavosi.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/89e907edd2cf15d208b1eb5d68568b9f/sagulututadalopubesujel.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210815011308.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/39170134119.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d72baad331f4892eed91548f2669171a/zomosalosajatugedibaperoz.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161036b38a4580---gevajivulewopoxesek.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/waxeluwipoxuxopavi.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/fuwenamorizufi.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/69545294525.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/webarulabod.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/midujokepogedasa.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd083ed548---guvulotefubigomini.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3fb48e3a1aadcb87e7d720a2aa412342/nezosalorokatekapaxakas.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/24000180568.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ef2728e9---vazilaxa.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/famazezud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=qpdf+decrypt+without+passwordPDF 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_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 17100 bytes
SHA-256: 803481e03aecf8bf587f30155a1b05c49dee5bf30f52f4fa16d8004de73ff713
font_01_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 10928 bytes
SHA-256: 4d31d2424e2bc0589defabf10540fb94c71e89088d290fc3de7d50d4e8c780f0

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