Malicious PDF — malware analysis report

Static analysis result for SHA-256 672be366b021b845…

MALICIOUS

PDF

109.9 KB Created: 2021-07-22 21:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5478bb5d273ab754ae9eef6e0fdb94c SHA-1: 9af5fed473191bf8bfce528ad3f05d1792aeace6 SHA-256: 672be366b021b8459e08a7e86ac9235e8a717b9cafa26643e8e678d374239b21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/egmorint52v4f7e05n3lj42ndp/26662305972.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/3rt4u5od5gnfqds826csl06vq6/70557531222.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/defopujunukifigagu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607527c618b0c---59071733764.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/9h6s5lv0e4vo7slbaucp4qps1k/98461460163.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/59583581907.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/20355791992.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/kamigipitifoz.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/be88ab56c4186615484329847e679a56/lamilipag.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/6249958196.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dcb063c50---92816046671.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/rakezapixolifetajiju.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f219c01c7039195b6f693168a6e23ac/nibaxuxumeku.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0225db3b---jijobajaja.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b21312c889f---nobafijanimowuguxexegufis.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c40d6bdf1---85437218590.pdfIn PDF document text
    • https://aedwea.com/upload/foto/beduzofogu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160748fe72fe74---fawidopepozorujenuxasun.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6f4ade96a82ccd89716ffec48d0133a7/41021047103.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ls1224aogr84jis47hms10had4/jowudilesitewoguko.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7spmosre7ks7dukumpuu1nb2u5/zinul.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hjs89jo1aei3al3irucnpq9ff4/fenamevukipupuko.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ede1b0d33b1---7445617174.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210629_8F06FD7DC45E2ABB.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=exponential+function+through+two+pointsPDF 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_off00014968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14968 11032 bytes
SHA-256: 8e10e974a04ab0479e0fb6c1405d7822a0b943e11441da1c0ab8335e23194495
font_01_sfnt_off00016312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16312 17488 bytes
SHA-256: ad8f0386311ea53960310b681c841ae1d9d12c96e258a23458d8c4a35e24f243
font_02_sfnt_off00019134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.