Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e454e5b0af8270…

MALICIOUS

PDF

75.2 KB Created: 2021-07-01 20:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 29be7437bbe0a57ed3cb827dcd182199 SHA-1: 29570226df08b717886b65a32e25ca22af791b1e SHA-256: 78e454e5b0af8270adfeba04f926dd3c1979a681ef7d499a7fe8b6ec71882eba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0d00c7e8---5628920647.pdf In PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/r61gouq7154aeo0q038b7v4ci3/99986226923.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c21c11d17adf4cabb9b0115c42092d2d/82896516776.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/29564469020.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/34482498791.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/sawuzixuzil.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4ea828lvbfdr1p1cs7m7naj4q4/5633304069.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/2256903379.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845ab795419---sogubojeju.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/59481115135.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/xewofipoxa.pdfIn PDF document text
    • http://ozari-ua.com/files/file/zewuzubupu.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/lulipuwogisus.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/90014060460.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6544dce1a669af27c9259ddb561bc87d/62896438593.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/joxemipikutebefimewepa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d6720rn2suulc5d591nkj2ue92/29826070238.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9a965e456---jovofibilekiturenov.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609717e527058---76977680276.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/83067737568.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2289160ea7---27627757412.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/00ffbd86d301c96b983500ceb77a4e62/49275345629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=75+hp+tractorPDF 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_off0000c5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 16844 bytes
SHA-256: 9ba07dcfc3f5facb52afc3c02c30d38f48e7b9501634dd132fbd90b8b85abfa6
font_02_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 10016 bytes
SHA-256: e3772d721a4aa8829baffd59dba681d074fe3dcf258c16fdf32a2169b9286973

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