Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd19d60491914113…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 07:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f53931955e9d794f05b6397b8c744476 SHA-1: 6d51b7015769c343bf1c799e9ae096f21c691ebe SHA-256: cd19d60491914113cd4f593372777fed67820002c89ade61b4f99d011b9c4ee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the use of these links to redirect users to potentially harmful external sites, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=let+it+be+beatles+noten+piano+pdf PDF link annotation
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b456750af9c---92937306429.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160814517df0a0---29283862497.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/zuzudezofixate.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9457c89487---5108107500.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2abf027e80---tigawazizutifunimemab.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/ferufaretagopanexu.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/kivutudesojawokonitim.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/76928134857.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/18971509277.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f869fc3bc6ce5d3b32cc4342289cdc56/rosazu.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/junivamurumupelibusefo.pdfIn PDF document text
    • https://tonitomov.com/picture/file/39015368328.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/6655305882.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/gibogigipotegisi.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/92057394883.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-8/20210708115557339119.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4081790094---paranex.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5213c8f0---13177305041.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/zokibi.pdfIn PDF document text
    • https://hotelcorona.ro/files/nizasabowawedibivepelobu.pdfIn PDF document text
    • 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_off0000d0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F5 18308 bytes
SHA-256: e1d5899efb485176e75a1bc984875146aaa4439f688c41d1ddb2bc67f0e379c4
font_01_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 10488 bytes
SHA-256: 5dfae7390f233272733a54f659cce89b768150b7d886f50bbb64d1e515be8fe3
font_02_sfnt_off0001191d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1