Malicious PDF — malware analysis report

Static analysis result for SHA-256 625c78a3bc84460a…

MALICIOUS

PDF

83.9 KB Created: 2021-08-17 01:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edc849db005f16eccbd8dc7dd186ed3d SHA-1: 85852fb408be604234d90e2e0a9eafa2e2082f47 SHA-256: 625c78a3bc84460a0ae6e2f3f913a520e0a34d34248a2a848f2dbe6d52bc6c0d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://tano-cable.com/d/files/bepojegupozaw.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4e87a85a4---lirilog.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/dmtllnr24lfa07g29ij28c1va7/bagudoniparatena.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9vcfg2hn8usf5gtccq5cpmld6i/29136682346.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/42533670853.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607772104020a.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160947585c6f47---buvamanaleki.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/lawixunurukisozogareb.pdfIn PDF document text
    • http://dymenahealthcare.com//upload/fckeditor/file/tamonagaxozazajadovimap.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/kijovanud.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/04c3766f437cbc1a8f866f7a7c30f19f/ramumudevi.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/bemidudagakirekafada.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/sakezeletabuk.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cec5e6782---bunuxiduxazegevutamex.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fofuxetewu.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/12053750013.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e754a8f53---xiwino.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/getag.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/62163601248.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/82688756354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=yann+tiersen+-+comptine+d+un+autre+ete+partituraPDF 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_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 10744 bytes
SHA-256: 2d42c617abb1e3485b428b77eb49d3bfced7e04d41b8847d7b4d307c3bcc2183
font_01_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 20404 bytes
SHA-256: 51581130c30606a9561e9e77284c1d3151cb0c3f17676b6ab1ae29d65be35bc4
font_02_sfnt_off00012966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1