Malicious PDF — malware analysis report

Static analysis result for SHA-256 133eaed962bfdd1f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 00:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 740caa2ed87d3cbe186b989a9d201546 SHA-1: b206fd100fae49e321627238b63b56bb9092d667 SHA-256: 133eaed962bfdd1f5beb63eb24443f2b9b32af0f46d177ed04713c542a9d8751
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure points to a multi-stage attack where this PDF serves as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=codes+for+brookhaven+music PDF link annotation
    • https://permargi.com/files/galeria/files/vexurimivaxakibibupi.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/disazagawofebowobuzej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2100e5f4---fumomedafavub.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/76707937912.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/tenogakadejidox.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/51558372131.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/53963862398.pdfIn PDF document text
    • http://usateatop.com/_upload/files/85878461513.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/14008928835.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/bonaf.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/luzixam.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/85282394727.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/70197021142.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/fuzujez.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f716a20083---xidibebajufox.pdfIn PDF document text
    • http://reopen911.info/media/file/78751121503.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/rujugixode.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/kojul.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320510e2bca---8675545327.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/faxevugugavow.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/27967872376.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/3d5de4f19db13eb5054616b0b31262f0/13237373031.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/ralomemusexojobikezopiv.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e53e03aa1e06cd20213f5e426adbc545/poxumow.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/78277388800.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_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 18500 bytes
SHA-256: b7231b4a0fb5a8e980ec668cbe1869a92a4f5bdf0ad129e3e9486f7ee8bf66a9
font_01_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12762 11024 bytes
SHA-256: dd97eaf17c1645a41c89e2b84acf84de1b77f0d1ba5fb44830da9596bf197737

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