Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2ffdff25b3abc6…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 20:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d7c64ffec9bc2554b74511cec14a90f SHA-1: 896d6a07df4c90ce6b1ad7c5bb0f572b0553518b SHA-256: ba2ffdff25b3abc69e5b8c1474e01c30eae408bf1ba0eaf1f4c5540b4d8bdbe0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://relaxbotanika.cz/ckfinder/userfiles/files/firoxeronanupasozerux.pdf
    • http://gold-carsales.com/js/upload/files/88619370843.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8sng8rebrtnontlkmhnck8do6/lotidavenedafobimeku.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a45d9aa6---98566797974.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/jozumusiwejijesomunez.pdf
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/7gal0l8ml7n69vckgtn5cv0itq/pesobubiwubiso.pdf
    • http://dogable.de/userfiles/file/37612971118.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/zagowi.pdf
    • https://die-elke.de/cms/elke_page_files/file/25498919335.pdf
    • http://historia-bfured.hu/userfiles/file/kujitifuvoxigese.pdf
    • http://wasserburg.pl/userfiles/file/vuxinewuzobe.pdf
    • http://skncn.com/u/files/73606247895.pdf
    • http://smwiarus.pl/ckfinder/userfiles/files/25980109537.pdf
    • https://expomediainc.com/upload/file/27251746575.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/juzoboloxulikoxowapam.pdf
    • http://okfilm.kr/userData/board/file/gutogovipubidugi.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/medaperunemikipid.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a8b8f73f---77223404200.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160daba4203d80---fiforaxesulirevidutifojig.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/6824379135.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/1902164798.pdf
    • http://floral-design-lindgens.de/userfiles/file/25653589476.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=a+level+pe+ocr+past+papers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 16792 bytes
font_01_sfnt_off0000e8fc.bin
1029e057d016a2287cba6280135681f9ec1ae59ad72fd97f177e5fdff12b28fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 10216 bytes
font_02_sfnt_off0001001d.bin
3a44b27c70e50fa8c9de36bece9d66a25664710ffdf2f364fbc082928f9731d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 17264 bytes