Malicious PDF — malware analysis report

Static analysis result for SHA-256 56867284d4435cb4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 07:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6746977e4409f4dc75f4049c0a64f6dc SHA-1: 0d9b0b5d5b34ee90cba8dee0cebab59ca9dd4090 SHA-256: 56867284d4435cb412554d38bac761944a8e0364ddd2d2ea94cb4b8201b3df23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Additionally, multiple heuristics indicate the presence of link farms pointing to compromised websites, suggesting an attempt to lure users to malicious or phishing content. The ClamAV detection and ML classifier strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://flexa.cz/docs/file/27978706132.pdf In PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4f44019a---kitopoxove.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/22966805606.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/56293597118.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/23968074358.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3d835eac87b0a6582f80e57d8eea8948/84592207773.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/97876280855.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/69304547898.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/k7h6c9p9lssra9e55rb32531mr/lunoziripirenawubi.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/40479043654.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/jigej.pdfIn PDF document text
    • https://pellevah.com/upload/files/kobidebarajevifiwi.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/12607452490.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/33663490475.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/zotalidumuxatoner.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/a3ke473r932bdeo66ggpjb23hr/jolutatuvo.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/zunim.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/12483439771.pdfIn PDF document text
    • http://ping-property.com/user_img/files/zagadopetiduwizup.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/lupaz.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/vajevugarikonamap.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/8522380173.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/20761875986.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/27965948134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+add+music+from+itunes+to+imovie+on+macPDF 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_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 10836 bytes
SHA-256: bdcef2f5ac4011d3a057957cda589924cbf627de55e0bc2ad658e944ef664aff
font_02_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 18060 bytes
SHA-256: 988394d44ec48555b7e5077fb94380bd504b8e94cf489ceb0cf598a730c6728e