Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52895a54cd90778…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 14:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0d76362359f095f002d4ab1def3801c SHA-1: 94c6357a426cc8c1502dcf680039e9d3c3119e5b SHA-256: d52895a54cd9077859ac4ce4beb40615d650fedd5971efbb003f6067c71782f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to drive traffic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://huntic.ru/uplcv?utm_term=kwame+nkrumah+quotes+pdf PDF link annotation
    • http://usateatop.com/_upload/files/77262692701.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/a2e15352ca683b633583f46fffa2629e/34712255629.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/31547328067.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/majabepoxogo.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce9109cf2a---xutezifedowololemixifiga.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/kuserove.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/34qon5ul81nhffvil054ie9ni2/91356305596.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/gudeganopedetewozufe.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/2a96e7808286d2916df306ca13bad54b/wofugel.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/418853dec219585a4aa8b7671514225a/56683242311.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/96b9956f7ac3dae3d27b3836e41624e3/20740290732.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/lonobuwaji.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/69874d552a82967fca7da55db2cf30c6/xudikogowusumape.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/bepibakunofosug.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7nkb28qsokmj6j5gpuq1d2ntjj/nitijopabovep.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/63605497234.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160884e74a6bde---38890496459.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160827650caac8---39004830393.pdfIn PDF document text
    • http://saimiri.name/upload/file/13566917187.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/fimisuzinipo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812a91d2811---xetusupulafosedu.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/daxobozexuju.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/pabobeduxifara.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1e0cfa80---mepedefazunif.pdfIn PDF document text
    • http://slsnn.ru/content/files/13998597379.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_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 17376 bytes
SHA-256: 90825966ad0d7cfe8ac02bd800eb99719e7341936794d90a8eb7f42c4c0b3954
font_02_sfnt_off00012bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC5 11040 bytes
SHA-256: 20e5c5087bddb9f6341c1be249a193622613dbdeb630d5f5d17ba8e20859f8f5