Malicious PDF — malware analysis report

Static analysis result for SHA-256 f445f3d662700b99…

MALICIOUS

PDF

91.7 KB Created: 2021-08-01 14:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04a432f05c1a22ffc0e9668241b19ee1 SHA-1: 05fed8f0638161fa0bd7517293842443d64d4505 SHA-256: f445f3d662700b99496498f3dc58ee02963dfb8bf16db67b70f73a339f876ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the structure suggests a link farm designed to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://ankurgroups.com/userfiles/file/wexixudevafisuforilufi.pdf In PDF document text
    • https://hoongnau.com/upload/files/fuvagakenavoretatofupas.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/67896585157.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4acc1f028b---23561876595.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a70d7f097f6---navozovov.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e577b896cb6---wozorofewirovaraba.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/1553117317.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/33147488545.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4rlas8eg0bnq3cu99mgs4ca6av/xobadeneruvugevobekilu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8hi4tje44h1psqbf7aoik1jiq2/601378155.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/tulerajibopul.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/vobijipobidi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b291bddb660---9224682121.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/xaboruvewibaz.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/dagokovugitafesegerapaviw.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/37718565545.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021529136371319.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/damedup.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b8n4cb8arrqim6nm0j23ta8gl7/15695880491.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/rezadavowukovetinozuravip.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/39346615634.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/jodupumepokop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=convertir+m%2Fs2+a+km%2Fh2PDF 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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 10668 bytes
SHA-256: a20857177eace5769b21025deeb68bba0ca6e9dbee9e4ffa5a8baec87a924f4a
font_02_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 18580 bytes
SHA-256: 203dee7e11d240a52862970347c78f916c4c816b6f689bdc87807227f2aadf12

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