Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19192269057c21a…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 18:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81981b78606ed69e712c2f59f7d0ac06 SHA-1: b79589bea1c704f94b45342869a0ac3f5c8a0baa SHA-256: d19192269057c21a488f57582a1f8b36cca15543d069d95669d818b5378dba3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nothingbutsafetyglasses.com/userfiles/file/91046515694.pdf In PDF document text
    • http://positiveforce.in/uploads/files/68220562767.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161416272a0c87---30526166160.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/bezesuseb.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/78912988349.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/27920239541.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/gotebolinupuruloga.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/20806662236.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/87236273071.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614175da6bdf0---18843640147.pdfIn PDF document text
    • http://dasbluemchen.com/82873146362.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/76817706000.pdfIn PDF document text
    • http://netflor.pl/upload/File/57652169368.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/60933675888.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/xisigebuzamujawutitolumu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf0e44723---wupatomukepizopa.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/wirajupajovepubuzu.pdfIn PDF document text
    • http://brlairport.com/images/file/pebewuwutenazupupenas.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/fovagisezekugeborabewe.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cf38d6c970d7402adb544143a2276213/gefovowum.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/93957359572.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ca2213db449c21214b688f3da21650fc/tazosiv.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16156bcc9c6f9e---dejuvujokadekonip.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/betajigasokugikemuxubiz.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/23374064134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+paint+for+android+tabletPDF 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_off0000b4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F1 14580 bytes
SHA-256: 95fc2b07ece0a12aef871d8b2fbab127cd8a726c06d8b3e66fbfbb3cff18fe0c
font_01_sfnt_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 10552 bytes
SHA-256: 97d0baa8c28d2e041f17f944ff71d7b3688a33bc538172cef8c51e3803b4d25a
font_02_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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