Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8499a0559bb9710…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 16:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6914f9703bcaecbfd82dae683390ba3b SHA-1: 79e82419c20bd4a0276c40f270a360842d8ee737 SHA-256: b8499a0559bb971069ced06999ac0179ad4c59ae02721eb5ffdf8db6292475b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be redirecting users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=linking+words+and+phrases+in+english PDF link annotation
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/be1f678886baa76ce88fe7c9f37e404c/28875650318.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608009b51d2c2---vetaxenomobawaxubosifolow.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/nileberivitugajotilone.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/rixavojigawopozenagobe.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1ea9e8d2fa9535d43e2a8652320fe5e7/85527537272.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/4apg71u869ultuncvqsrvrgj99/44274450189.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/wixejejigogafiwigakagebi.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/96978051993.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9vc0bjoqrd1l1gppf1ihvb9jf9/84324400832.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97565c159---75996714644.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c978aaad11---vugeravekelo.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c624abed1e3d422e2ea81185767152d6/vekiziditosafusa.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/76f240416119409d9386c5e96d4e9aa1/1874395816.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/96685711485.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6e1b80e32---28005355792.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ccab210dd779ed539d1817cd680739ab/kotapagosadodigos.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/104a89236cc69b9894ac6ddfb4b906f8/jezudoroveliz.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/56472270094.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fa7fd06ca425771c2ac73b8fcbb24c7a/netazarokubeloz.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0cd25cd61d3f91f0cb3e65134560da02/11423180183.pdfIn PDF document text
    • 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_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 10708 bytes
SHA-256: a23b9c9ea412c1ebe6d98daa90b2b105bd1be9deb7b8f7d7bf18b4be25825729
font_01_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 17232 bytes
SHA-256: 827fc9a449c378cc85c28925fe04eeace9e101fdac763402acdbf86a4866ba63
font_02_sfnt_off000138ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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