Malicious PDF — malware analysis report

Static analysis result for SHA-256 87841d2e692c51b3…

MALICIOUS

PDF

78.6 KB Created: 2021-09-10 14:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 01a5812077420a35c8a900d0ec5b9cd6 SHA-1: 09c0f7f6b5b1a8340ca6a646a2e0def1e9a2d200 SHA-256: 87841d2e692c51b32a5be3c6e9d192137754d256891e1786a2318299a7cd690d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mmagame.com/userfiles/file/ranogapotifikol.pdf In PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/towodofez.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/pebokedomuwejomasofudus.pdfIn PDF document text
    • https://diphong.com/uploads/nonujoramojufowajileseno.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/roxoxolodaxiluruzixutojop.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/ruvoxumimukekawumozo.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/pixupivekibeborawamirexe.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/duxawibutolomef.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/19540324764.pdfIn PDF document text
    • https://blugarden.eu/file/85277609211.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613613e6c9dec---misezew.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/fozuxulep.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/warorawof.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/57215614724.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/40814942828.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/11672427958.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a575adc4---85898710490.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/gudiw.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f0b459f9ed6e4ebfe6b30a00461bc926/78162949035.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae63436229---wuvetuwupepisamiziti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ims+settings+apkPDF 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_off0000cb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB95 18884 bytes
SHA-256: 01b6b027317437da15acda019e68519e2b61e13f7bf6bdb409879ab1a2ddccee
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 10372 bytes
SHA-256: 2b6712e20d0de5696e71424515c1218c1de7c2b04624af8b121208cebfe38754
font_02_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1