Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8eb058f869d29e7…

MALICIOUS

PDF

95.0 KB Created: 2021-07-02 03:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 60afbcd6f316028f68b9a2ba61fecf65 SHA-1: bfca58dbb938f24ea62b4a003ef4bc1d6cf020ca SHA-256: c8eb058f869d29e7d9b0fb5b2c472f76c02f9e8a34d3d13fd77d37245e01c80f
164 Risk Score

Malware Insights

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

The PDF document contains a link farm hosted on multiple compromised websites, designed to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous links on potentially compromised CMS upload directories further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/2ljhn43f4845t4lhd5rkdi4rjg/99793954276.pdf In PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/be3mg05egb84ko9ln527nqeb5m/64725441319.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/danenanid.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/l6m3bodpoh1pimetpuvluejhfn/24282357011.pdfIn PDF document text
    • https://kermanrooz.com/img/files/83721033294.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d323ed1d5f0---88267577516.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7bdd4bd9---povufetuvo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a61b7461b35---jukagewubad.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/851af22a025c9accd6312ac13ed7c251/7326580489.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/vusegudoxokamozopamug.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/14de66e5b57f6dd45497a93c06efcd59/30858891347.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210526152609.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/iaobb0v3ohvs2ot9s1cahqbqh5/67147246619.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6b9d9cb79---dowupavepigobitis.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ce94c73cc---93284348536.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/22114951402.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/99265710839.pdfIn PDF document text
    • https://tomas-music.com/contents//files/34295650378.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/saxuwaku.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed29494fde---51745568183.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kulewipa.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/93417327257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dwg+to+fusion+360PDF 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_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 27908 bytes
SHA-256: 76f263f641b6762a8f83eb16aa7cf9bbca23a98641b23e134b6677a8f626e857
font_01_sfnt_off00013d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D43 10596 bytes
SHA-256: 641c3707958a49af0ce12090cff603172ec48d63ca0390cbbde674a585f271a7
font_02_sfnt_off000155b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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