Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08f7e011e8ab6e4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 14:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f4903940b7ef5fcdf33b0423a0f9caf SHA-1: 5f94f56b0bbc0588de6c43a13302550694c55966 SHA-256: b08f7e011e8ab6e4e61aaa106b5dc07f694b47b4d998a4cef9e2756478be9c77
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://acronimocostanzo.com/userfiles/file/54398240080.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/zopejudefunogunojekerak.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/83879316919.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d606c3a82a---nodunedutufus.pdfIn PDF document text
    • http://intertribo.sk/files/98860102690.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/fosexoxusawot.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/49026329853.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160db799cb7a66---riwizaravusabulaninewodi.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/ed2a05045634bfeb9d2bf253da069663/vasagelababe.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/95917245004.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a728776b41---rilegakogol.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a56e845d63667e90bb0346363b815a6d/lodawa.pdfIn PDF document text
    • https://menu2uplus.com/images/file/72783248606.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/sinaberedepulobawika.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/gakefujujefiloximikor.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d1136efc7---nowoxurovuzoribekexodax.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/70220934800.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/8186493807.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/1oumlnlhe15ner1t8aa9kngbj4/43327823138.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/462bfc5791739d58c764a29fb47aada9/bulijopepidilev.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160864da58afd2---40254610905.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/faguzukerefetixufibije.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210727173602.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1c4ae744a4630b0e7338ee2e12d899be/13542552995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=american+beauty+movie+script+pdfPDF 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_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 18144 bytes
SHA-256: 9bb91c568c56d59bf7a2f7535fbcbabbd0a4dd9ab73d4026fd01638e4d76684a
font_02_sfnt_off000129f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F2 11136 bytes
SHA-256: f10d279bd7257f1815b579325cd6ebf7577683a595e48d383f54501d9202cbdf