Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8048cbd1356c77…

MALICIOUS

PDF

85.1 KB Created: 2021-08-25 19:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4916c01a7bc1412c1d5011a6d82448f SHA-1: 677f520abcbdb4888090f6f674551fec293e6a59 SHA-256: aa8048cbd1356c773aabfe623745964a6a7105d720948a319c5e4506fe026034
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b5c97a51---xawedinixim.pdf In PDF document text
    • https://trexanh.net/upload/files/gafawizupusekufonofaxen.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/63972087794.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610899dc91a82.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c14c74e7302d47307eff2314b932ffd5/71869312555.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fa798e10e09897a54b35021f7839c663/juwonu.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/pasujetotikokususa.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e2eea5d33---92463449681.pdfIn PDF document text
    • http://fittbike.hu/files/file/24664112454.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/sinekolilelima.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9m0mguio4n1cemg5mev27gjt6v/77234030746.pdfIn PDF document text
    • https://hirurgija.me//files/12480657897.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/wowiworo.pdfIn PDF document text
    • http://kingnature.ru/files/files/21825852099.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075e808e6cc5---vupolevatumu.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/56060265097.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b5fb590b8---duxugitetov.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/m6sh75rdjsc2nmgjcaebspl938/tukavomijevovebojosujudel.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c778bcd07c---81033093844.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8b1fb5b27d7ad1e683658860ece1035f/85264723263.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/fekuzaziromodazejazapirak.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/7604262249.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f818a1a39---nodera.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/f563f54de4ead99704f279caffe7212b/zadezuvafixogubogujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=physical+education+praxis+practice+testPDF 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_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 17676 bytes
SHA-256: 8841d207312b75d5de2206faf3491b79b6caa1aa8871a61f0adf8a0bc54434be
font_01_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 10928 bytes
SHA-256: 1f2bf6e5ad07a0fa2980b35680958e783fd5bd8dc4e28089b89a47e32c8ff1c5
font_02_sfnt_off00012c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1