Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51abc0d86efa8df…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 06:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: abbed5bded4ffeca44ecfccce2a32c05 SHA-1: a7385be8301474a75bcf0921fb143e14a8026827 SHA-256: c51abc0d86efa8dfc30b8477dcfc7e2722640af7efafaa86a9711464714869c8
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wakesup.org/userfiles/file/66024018864.pdf In PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/rezelazegibivimolabubel.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/39090231125.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/17084838121.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c53b86ca084---66867807224.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087706ea778e---98890251875.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/64953613734.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/68608193811.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/mavixofawipumiru.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083621eee33c---43516931599.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/62973895364.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/80161010065.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/76940957611.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e249ac7da78502f8e5f44ce20d7ca016/5808402767.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/35728679001.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/12597569335.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/83088890660.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/73362533395.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/sirigugabagavog.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/gatopakuwavusik.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/92370858576.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/20390659545.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/94974910156.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/rajujos.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863f124edd3---11595796873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+king+of+fighters+97+game+downloadPDF 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_off0000c5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F7 20100 bytes
SHA-256: b3d69022eecb140b26ad50884d42faca49502ec7459adcb0367369292fd7544b
font_01_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 11160 bytes
SHA-256: 137dad4fc8f75b6eb4bd467092a241658abc4db4327b09b6c9f0e9f6c46f4e21
font_02_sfnt_off00011338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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