Malicious PDF — malware analysis report

Static analysis result for SHA-256 496c58d623e42515…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 22:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d94a85cac7020045bf859db343942fc SHA-1: 2b62bcc977b0fa88dc90ec1ecd7cb0ed6047fad2 SHA-256: 496c58d623e42515fbc5d49f3ab003a69719f7dd45481e4b9662b50a86e2a636
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, are primarily used to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/t72kh5imet9pvl088a8mlkugmg/xejoxaduralunaxajivifuz.pdf In PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/50176841966.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/21204646679.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/27479046227.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210608_090539.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161109c7f174d1---89671212505.pdfIn PDF document text
    • http://parfumkin.ru/files/files/33396852418.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab692178a6d---lupevipuruxikupo.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad0869b97d---mogefawawub.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16128dabab4a6f---gotovimesurobudokam.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/aggookutvgv16p7t869btoqa9d/ximolufusutonowofaxe.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/34300700016.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/30165844092.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/6558889212.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b621069626---7536540187.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/molidalofiboxe.pdfIn PDF document text
    • http://eventechsite.com/files/files/87652679126.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/betuzegekigujo.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/17465445277.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/31091249184.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210601_052428.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/witolojibim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=halloween+coloring+sheets+pdfPDF 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_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 10976 bytes
SHA-256: b82c62adff909a26642c753ac7cddb9605985839ccdff4a5d8e540f40d0f8f3f
font_01_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 17640 bytes
SHA-256: 9ac047f6fcdec126be822e0385f9f63758cdbfbb4853d6ce5fb0c28201671356
font_02_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1