Malicious PDF — malware analysis report

Static analysis result for SHA-256 710a3cf12b979502…

MALICIOUS

PDF

89.2 KB Created: 2021-09-22 09:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d94ce4b863b20e379db2ef5070aeae40 SHA-1: cc0460539623fc0f6fc5bfc603a671740d65d925 SHA-256: 710a3cf12b9795022f1c30cbd14a85c204ae91b069b714e41cb7ea7e7ba70c5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://krisoc.ru/uplcv?utm_term=torrent+tv+android+apk PDF link annotation
    • https://happen.webasl.com/userfiles/file/79437064565.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/85458906667.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/97208111273.pdfIn PDF document text
    • http://csp.hu/editor_up/61438384606.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/65565880751.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/mezaxesepevalo.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/lusilije.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109120938581350.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/romol.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/96189723165.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/40544074162.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/razusadafodumupoberimik.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/bifawawesuvokep.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/bobedologevupir.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/lemawotelomekofikibebet.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/tutadawabenuwexudof.pdfIn PDF document text
    • http://recrute.fr/files/files/nukilofuwafozidaje.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/92157668418.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/14666398211.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e84177e1---nowuteduxebufojo.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/duridadukujagudilesesiso.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/wonoto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b044b01b3d---bafifefuxaremarana.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5da77194c555b7611b89e66752b6e025/7295843139.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/bijafeloxiwosaxifilunowaj.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/konogatexinefodaxow.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/78406667207.pdfIn PDF document text
    • https://priscar.com/documents/files/tisopovezuvome.pdfIn PDF document text
    • 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_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 10292 bytes
SHA-256: e85899ad47e93ae2c55bfefaaaec83978dba55fc13c8a8a9b9a21674ff15b07c
font_02_sfnt_off000125a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 18884 bytes
SHA-256: 6c7dcc64f42da92f2b4c6386017e7c579ddb3a85b3e4d9b34b2172533428548d

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