Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5424f4a4343cf3f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 20:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c76651eb3e3bddbe1b93a609a190e0d5 SHA-1: 214086112f63e8df6073cb9cf06ece049497e7d3 SHA-256: c5424f4a4343cf3fabbe249f0a3bb0c6b46aeee2c118c35b893047c3b0cd0a56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://rowadalbyt.com/userfiles/files/76196881299.pdf In PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/jupazarag.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/7a89bca7d4a3426706e5ec6e766d0722/20885036405.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/17469619491.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d7dc0b74---48069532793.pdfIn PDF document text
    • https://ancoraeducacion.com/images/84287971848.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/liwirozufarijex.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/24973549292.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/zidiperuwegejidin.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/10682829211.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a3899e4ae2a19d35ecbd4da6fddb959c/18381405373.pdfIn PDF document text
    • http://khocabien.com/uploads/files/28097733559.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/terapereloganidofejaki.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/rasajajozeredisezav.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/f3prjvmg2frjllpp1r1a8gn7mn/kojinew.pdfIn PDF document text
    • http://midel.me/userfiles/file/92981246125.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/wubedigew.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/48883094171.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822151a45c6---16706555627.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/fusukewupepudedumabiw.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/77718137099.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/51412136502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fiche+de+paie+2018+pdfPDF 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_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 19308 bytes
SHA-256: b7398c3ed736a81564052a85e78cb0cb975a4cdbb8cbbd9ae9c9186b615339f0
font_02_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 10560 bytes
SHA-256: b3b70d2f79a683ba7799b1382989f5a4547f480d36ea51a8e88cd0ed08572dfc