Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8d3bbf7bf47495…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 15:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17f006bb0985230c5ee8a1bebe98d135 SHA-1: 92c22a9689654841cc58533787e1d0d7c0bf1ef6 SHA-256: fa8d3bbf7bf474959cf17efe56657c9f3dc7e2c9fa8adbd8c0321989ce2bb1ed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://harckocsik.hu/userfiles/file/36517771339.pdf In PDF document text
    • http://angelcabrera.com/FCKfiles/file/wasaxo.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/mavasolomodo.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/39917834737.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161440b4e7aa46---gazagarugakivuguruvoru.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/borumozak.pdfIn PDF document text
    • http://husplaza.hu/editor_up/buvorixazimilugaxununok.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/36055798913.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/kojejokawemokirulupo.pdfIn PDF document text
    • https://pr-dienst.ch/file/vujiwajov.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/99880492104.pdfIn PDF document text
    • https://ivanamihic.com/files/72397338678.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed41a8c4fc---dobujad.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c3c5a2bee66087597c568a1702487744/22316200758.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b886f58a---12188876403.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/dokozuxofemubogaxev.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46755a641---vavur.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/161e6b4596bd401f4a39284431271603/47302272750.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f219347f96---tadepogiz.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/linuvekadote.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/7587383331.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/74279272454.pdfIn PDF document text
    • http://espicycooking.com/files/file///82405028490.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/nuwavu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa204d2ee2---48196543828.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/bedef10198387e18da4c0d744c0e8ee4/96126964302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=resizable+keyboard+for+androidPDF 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_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 10700 bytes
SHA-256: e4368c46d45c9acd17b8991e310f45c9a24452489f48329d8d5387da4c015dae
font_02_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 17008 bytes
SHA-256: b1a427552cb03b10df7a22f098d704eb45392307e4e8056d460bb536d963f51f

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