Malicious PDF — malware analysis report

Static analysis result for SHA-256 42224f002d5b8441…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 23:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba510cd3157a6db85efe70f5dcf506db SHA-1: 17ac2d3e04df3a4c5864b119fe6502a5ddef6e27 SHA-256: 42224f002d5b84415c87aa03fde1740de2f93228dbbe251d0a53af7818cd5cdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. Embedded JavaScript streams are also present, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • 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://cbstav.cz/file/guzitiwasisijekomuvetisa.pdf In PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/xixaxud.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/43025217015.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/gapanomu.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/21661830150.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/28709960454.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/72351252805.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/64670734311.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kativepifibo.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/nadawevurenisawo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ccd0d92fe---pujubinolowar.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/91174487464.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/74592325262.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7304ebdf---74839661295.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/wedejulezuwamesugi.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/vezojekawibizipixeme.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/ruvilumovedu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f5f8901f480f19679036ab772508d188/tezafuvagazowibasum.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/44322109417.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rgpdss3stj3ld4v21r5notn020/gimomuwejer.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/munabefasase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=transferring+notes+from+android+to+androidPDF 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_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 10612 bytes
SHA-256: 572459e2dd48a38b43e7f1f0a22089f1bbfe8ba30bc0b8ee28bb531e029d46d2
font_01_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 18640 bytes
SHA-256: c685a57d5762bd59cb05f5f790b06ff1064975b9dcdab76926428588a672cdeb
font_02_sfnt_off0001282f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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