Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1ccfe847a86bbd…

MALICIOUS

PDF

87.4 KB Created: 2021-08-04 20:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b789595a04a2dd7405cd34992df6e64 SHA-1: 6de70cf837442b8c4fae3a371ff9bd868d03e5e4 SHA-256: 9f1ccfe847a86bbd3e56690f00762ad604cfb6e647f42b94c0bad17adf0cf621
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The primary function appears to be directing users to external malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=how+to+take+apart+a+kenmore+connect+dryer PDF link annotation
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/6b4e0a6d90c4071f0f0300eecb128f12/4123705093.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/49033185811.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e8ea94ce2---polozomigegidasavozu.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/foxemirigosugutokowo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ec7321517b8bddc778f25316cb5b7a71/jexezeliwubaxivumosodet.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62381758688.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/58960871696.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/gudigujosip.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3qsic8hva8r0npfsm0q51rk8r2/nawuxejeziputewumuzawari.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/sasop.pdfIn PDF document text
    • https://rajakedua.com/contents//files/wejatuvutesagidubat.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/tio5572vensdcjmfo4rfdh8mi8/61108026596.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780927090f2---76077678591.pdfIn PDF document text
    • http://mousike.it/img_ins/files/91208898323.pdfIn PDF document text
    • http://palami.by/images/file/fekitixavapezon.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/62560917872.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/fezebi.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/57f8db1352f1807eaed6ce2a0705361f/vavunifovu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df3531aaa7b---96998547951.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609630026a6a8---bavifawinalu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/10251221018.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd61b48a79---fotejogajegumubujewafuzum.pdfIn PDF document text
    • http://cartopack.com/Images/file/pogomo.pdfIn PDF document text
    • https://lapdonline.org/file/rezato.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_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 10652 bytes
SHA-256: 0405f4d8d979601d87ed592a380f25905a60ca08805848942b318d7e752afb40
font_01_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 16684 bytes
SHA-256: d0f4ad8ff12f0c8f9b4f7cfa6d7c184f0ed123ebe6000ec9bd1182d180588240

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