Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ddbf0769fc22b2…

MALICIOUS

PDF

83.9 KB Created: 2021-07-18 11:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f4d98e4f0c22e1ba25b4dd36d73995b SHA-1: 350fb746548d2533e20c8c922afa68a753f89b8b SHA-256: e7ddbf0769fc22b2cf5012d4c3a10df7de715e8cbf69fe34e7658109704857d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/84523088354.pdf In PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/saxisebipirujuxoti.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b5e94a4f6a3708efcde7b64939ed2aa9/77260738413.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/72027963379.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/gubenibiniliwajebusato.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/65111654162.pdfIn PDF document text
    • https://tsegypt.com/file/sukafozemirekajariledit.pdfIn PDF document text
    • https://primer-spb.ru/files/files/xisada.pdfIn PDF document text
    • http://iltorg.ru/upload/file/wogopel.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d4f9fda1---9429842867.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/14291404033.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/vodijovejovazuno.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/69749272872.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074111758808---58331558823.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3fcf1f3e7cc79ba7e1e6a94e7a4f7380/bajoronimadusijasoruz.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094f6a82434f---disojazeta.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befb191d5ed---67205532119.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5968580341---583794592.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/rizogajefubujo.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/54455528221.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/38108773589.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/17b72b0aad6858c683e4481321348df4/bibulanufigafapupifaruxuw.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/596ffae023d757847721fe25b440df4d/58632272835.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c596a39b8042f398574f75f85bc842c5/suforubadin.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cb3a645a---luloguwagovavozeles.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=radiology+physician+assistant+jobsPDF 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_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 10992 bytes
SHA-256: 2ee5bf426a890702db53cbc8e6d8be5bc890593def2b8d8384322f91095fc82b
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 16168 bytes
SHA-256: 54eb98f79b5051f1c6ee4bc170ecacd91246024ed605a5ca0b7aa891a26b4e38

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