Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adcf522c25e54c0…

MALICIOUS

PDF

93.5 KB Created: 2021-09-07 20:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df943cdfd3aec7249498d5aae375c238 SHA-1: 942795d97890c89a8007bb3a3da34cd76fd63b6b SHA-256: 1adcf522c25e54c012462a5b6ce11d124362d001fab9cb1ac0b5e91d02d4150d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick the user into downloading a secondary payload or visiting a malicious site. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=lamento+della+ninfa+pdf PDF link annotation
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/1hbdvaq723cjl6v282pln09ght/molosupimokorusejuvasas.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/3ec1c80b7258b21765c32a47691b0d77/jopute.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/40989efc518d27dbbd9ba3ac0c2fc5f8/puzoxaxikewux.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/28596958622.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/mavuzewokokizisazinaxu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612b7c88eab08---vimobazomodaj.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81335b1e97---nonoxarovasawiritonadu.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/rotivus.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/34400031237.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/xumulobowebozigogukut.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///43023026853.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/8f8ccee67eedbce0f66af7ed320c4319/rakeno.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/badesosojonaxile.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82b4aec19---pakigotulovepale.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b2b679e5a725d03640d29f6902a0dbff/tejifikutijipobugoned.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/14754715164.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337ea6ef7d2---29976934526.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/61065061968.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/81830340380.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d6b86a5c0---37930749085.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/94396797415.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/mef6ate618dhelhc8ec4eiqnus/kareduri.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/43739796897.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/hlvcm1hju54suop8m5ejed1h1e/52187200499.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/wufepezutopuwolufet.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/71725915611.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/089187a7919b2c50e9e7a6180df7140f/rexewoxapuraweg.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_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 10348 bytes
SHA-256: 203f758a843142816b4c3dc58bbb893225b8f834ca25c3052e98848f98ee5084
font_01_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 17780 bytes
SHA-256: 07208c89b18715ea1e1e0afb29cdea7b88d9aecfa60cc23047105beed8358ec9
font_02_sfnt_off00015067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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