Malicious PDF — malware analysis report

Static analysis result for SHA-256 87822c444c8b56e9…

MALICIOUS

PDF

92.2 KB Created: 2021-08-09 02:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbb393c9993fe167fd74fa8760eeff2a SHA-1: 223dd9441af605d2245abce47e60710b5c43fdd3 SHA-256: 87822c444c8b56e920b92f42b3700864c39b6e40e32a7e7f2e31c52d40f59cf8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • 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.
  • 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://elmaga.lt/components/com_mijoshop/opencart/image/data/files/76260402108.pdf In PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f76d323a7ae---zomevutaput.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/naxixivosawemigo.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4ecb9f468b275738034f0049ac575f5b/lesefajebigojogelezas.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607251d4ee99a---dodojagarew.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/bo1r1r6du8l0thej8js4i0mv41/vijavabiwonegevuku.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/zigasamikemarokagivev.pdfIn PDF document text
    • http://kotolantopeni.cz/file/42381581614.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc7a094866---5189189474.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104e2d40fd5d---nukivemipofekotel.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ecb0443822eeb4da0aba7c8a8e999b72/98763897558.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe262477902---69858035832.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/75633151510.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/12aa00aghvq3elql02hr9pphg9/zovomekubugolizapol.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f4735db00---sefuwamenog.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/53602820594.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ej0ebtjj6c5h80670rraqp3419/16458797172.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/37806296360a265c053d6b.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ke6avn8g6f9nn97gs5pukho7j0/winasamiv.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b532682c8---dosekokafi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8587dc9a34---77638989109.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/goxavi.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/99398077642.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/88458494490.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/27015888728.pdfIn PDF document text
    • https://tpk-m.ru/files/file/bikopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+song+plays+at+the+end+of+narnia+prince+caspianPDF 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_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 11004 bytes
SHA-256: bc23c600d57c08ae85453a9f626056b07c74df6e98176f5234aa6c8df110f320
font_01_sfnt_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13450 17400 bytes
SHA-256: cbd746f29a868cc6a1cdf448e2e18056f5893d60a865faa295a5d49d13a8a7b5