Malicious PDF — malware analysis report

Static analysis result for SHA-256 feaa977e5e7971fe…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 05:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 25ca56c66f78e366a597ed29afb3345a SHA-1: 52f2978c94f9bfba734c9cf7a2ce0068c44b2837 SHA-256: feaa977e5e7971fe3f2ee879b3e2f1e2ba4a95d87b92bc11bffd74a23d53443c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it's designed to redirect users to external malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=how+to+sign+a+signed+pdf+document PDF link annotation
    • http://www.monts.sk/upload_images/file/zaxamorokimazoza.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/91500606943.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/jovatozutalolaxenu.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/52777847741.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160818e2eb052b---kigob.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/zomosalajo.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/7037823816.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e8ffeed0d---97253432213.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/bejobek.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb15e0e8cf---zivejefurajezu.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71c60ca75---75678309387.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/64518268524.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/qqq6lq8bqqi3jtcenr4rf987p1/97216825371.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/megeviwofuvafupapov.pdfIn PDF document text
    • http://sooclose.eu/upload/File/91816116169.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/lilereboroviwunak.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e40c1aca541a972bbc30023c8ef07904/magikezejikorefofowevefe.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/15ffacb85beb791818885e1957867294/84013458243.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/40f639030ff166cf587213ef52d257f8/limozaxo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/19c68249a0b4bcfe7f7f9d590699f5f8/71584069249.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/lonegoxatugazem.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a945d68848a---ruruvurazabagiwukilewov.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/pinenuvoweje.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a93ad363940---83168272447.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec5aae5be---posuvopifumimilom.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_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 17728 bytes
SHA-256: 14e3d4650b2b7c4b6a024beaacd44b3af23b59b745690ee8e205b306f0443963
font_01_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 10996 bytes
SHA-256: 58bca6e7c9033a3d6ef6a0a120dbd720a579994fbcec7ef99e1167f48b9f261e
font_02_sfnt_off000133aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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