Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c18c3644b53e04…

MALICIOUS

PDF

150.7 KB Created: 2021-07-16 14:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5267b16bbef3ee7efa5e505885c0b5d8 SHA-1: 91a024f060b3bdbebdadf0b85de635a9ce981033 SHA-256: 33c18c3644b53e04e297152280728f1d1a7944d468fa90a82401ad391d876c3f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc34d05625---20439340121.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160887ad1e3a72---minomugozevisuw.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608256cc9775f---41338139812.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769e17bafc3---93234314001.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f4084cc1a---rosogewirujakileguxupe.pdfIn PDF document text
    • https://aedwea.com/upload/foto/sareverokale.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a163a923779efc531d55d864eeec64c3/xalowoturedikefumozosipov.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/58bb5f7d0c1c24aaf9241a22f9df0430/juwat.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/tomiv.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723b48ddcb4---80809499765.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be31fd0ceb0---79309037198.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e9de3ac7d028be43720de962764ec3b4/15288428868.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/26756566952.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/289133918.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab90b28f97---12884821525.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cfnjf1oqdr7v4eu07uik61pva1/70877954985.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3296551627---fibofojaxorarowuvowijat.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ghumuvnhf0mubu5ilc6hdojqi9/66389767423.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/96429474424.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/radetewevipote.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/85310499768.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g9j2ptghs5ul2qb953j721l7k6/jolugezomuvi.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/ruvuzonaxubuwinamukono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=left+4+dead+2+witch+modPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7C7 10564 bytes
SHA-256: 496bcd89d11c235972b779d691db8c6e710474696afb8db0a1a4f39ac25d291f
font_01_sfnt_off0001f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F00B 18756 bytes
SHA-256: 996eb04b60885d7e71f3fb96e14f94da2db37d2551cb1f1daa1bd08e667a8360
font_02_sfnt_off000220fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x220FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00023909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23909 5484 bytes
SHA-256: 09f7a6b297500e5c3e1f493b3c23e5792779ccb2c8f7a381c451a198eff91d80