Malicious PDF — malware analysis report

Static analysis result for SHA-256 949cec3b5dfea59a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 11:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a180d65083a9e4a1c9fb33a73c5d1eb9 SHA-1: e0e9038f6f5f4fa57e7e4b587b895581c6a19c56 SHA-256: 949cec3b5dfea59a8eccd8ee740978661f6d692a7ad7d0e021817db7ec800eb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://z-sinpro.com/upload/files/32557727531.pdf
    • http://rcot.by/pics/files/zesatubagew.pdf
    • http://michellenevinracing.com/FCKeditor/file/25408415670.pdf
    • http://pappteam.hu/userfiles/file/zaximun.pdf
    • http://toyteepee.com/uploadfiles/file/210907174409297286b1fo0e.pdf
    • https://kemxoi.vn/app/webroot/files/images/pages/files/gegijedarufusi.pdf
    • http://gloria-eurex.com/images/blog/file/19818623802.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa919a1776---74679323206.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b4f91a185---4030674523.pdf
    • http://ventima.ru/userfiles/file/73893645665.pdf
    • http://joy05.com/_UploadFile/Images/file/21574110442.pdf
    • http://campfirewtx.org/userfiles/file/mibijegesenokexituresad.pdf
    • http://lor-rostov.su/userfiles/files/87015258304.pdf
    • http://aroma-es.site/yamituki-n/uploads/files/77445598017.pdf
    • http://autosoftware.company/autoresponders_images/files/27408240030.pdf
    • http://rjt1.org/upload/files/93661951559.pdf
    • http://tgtech-auto.com/userfiles/file/tijinopon.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210909_54F0B6FDDF3AE9E0.pdf
    • http://fabtur.ru/upload/files/31188459188.pdf
    • http://songhakbbq.com/uploads/files/45911963097.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b49867385---kutasev.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dee99ed29553ad668458f05d444ee752/kozurajatutifisobo.pdf
    • https://mayphoviet.com/media/ftp/file/42924027263.pdf
    • http://tincorner.vn/uploads/files/gedozof.pdf
    • http://www.farmaciabergua.com/userfiles/files/lonesaduromami.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=world+best+android+mobile+game
    • 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_off0000cc20.bin
237322210883c250a926459ddc7b460dac754e16aabaf324b98966fea561a1e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC20 17188 bytes
font_01_sfnt_off0000f89b.bin
0d64eb230242a4b42ca07460893c77237f2b6a39c7a3c6bd388c5df5cf595185
pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 10724 bytes
font_02_sfnt_off000110fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 16792 bytes