Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5902c2a504e5ed…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 04:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a03acb689e449e47fc496c5cdb5f573d SHA-1: cfa3b02c245e9af2233d9d4b5af228180133628b SHA-256: 6b5902c2a504e5edb87e4189c533780767e442bbe9c178427f6b71659de033b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users. The PDF itself appears to be malformed or obfuscated, with no readable document body content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d08cba93---52973077249.pdf In PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/515576482430536e076c74cd6353d34f/leporevamufepegemideg.pdfIn PDF document text
    • http://builderall.info/userfiles/file/89175454803.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/32820181069.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f620ac8c0e4f5e267fda41fc69bf5f60/57279873280.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41ba5cf061---3412817764.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba94c5feed---lifonekixijujujaxumizo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cafd3c76ae---20533888764.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/dinalugif.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/eg8tpbfsu9d92alrf9oosaf7c3/sadopifopuvifokipiwog.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5631a38684---mosogixunoj.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xeratagobivatomap.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/jsjjq1964jc6l9jl29868ptpq4/91084927470.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f9a4da072026d1c7df616138163d4741/jomona.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c776b74e---finoxuvevorolilazojo.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/21923191229.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/77459357324.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/8217324632.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-10/20210610133406193408.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609372b7bd193---vasabemogubaluwaregami.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/mamevexipeb.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/255e297693850d476ae724fd705854a1/kowewebul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sike+meaning+in+textPDF 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_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 10288 bytes
SHA-256: aa190a5b41d2469179237fe7835ab63d69bc60a321a71ca0cb754f6b21cf742b
font_02_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 17680 bytes
SHA-256: 9dfdfe276a8eeb6c630dc97c32c88fc1a427a83ad8e5d891ced6e23a64267205

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