Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5a20cb536fa683…

MALICIOUS

PDF

85.6 KB Created: 2021-08-25 10:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7fa905270b4a247d38005d0dcf0aa68 SHA-1: 539a22ee129120771db76adacac53c40d945a0f9 SHA-256: ca5a20cb536fa68341e8829d1eaf055e3042a02dcfa0d5c9e4950023c0afad92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it's a phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, suggesting an attempt to redirect users to malicious sites. The presence of a link farm on disposable hosting and compromised CMS uploads further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://tfh-filter.hu/_user/file/67012166097.pdf In PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/9151091609a7139e4dba66e5d0388e08/fekijimiziji.pdfIn PDF document text
    • http://poorclarescork.ie/images/27635075806.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13215652764.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160804ef2bc5b9---67155319938.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/588b34b4e613a6ab4cf7a98b160ffea4/21063954536.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaf89959c4---zadisowidowepa.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/7608784275.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/48891052266.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/woxojelasasaj.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9a783435---fekezevamewobixegise.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608768a8b1594---88268883098.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/366236823609306b0b902f.pdfIn PDF document text
    • http://capital96.com/userfiles/file/lubemovujidal.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b64def19---14529543336.pdfIn PDF document text
    • http://marymo.ru/uploads/files/79631414847.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/36570292502.pdfIn PDF document text
    • http://hkalc.com/userfiles/ronelita.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/92640278756.pdfIn PDF document text
    • https://area5srl.it/file/zebenisakatatupovak.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/48272237342.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/sipinakodikukumezowa.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/bevinafar.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/59778110873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cytotoxic+chemotherapy+drugs+listPDF 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_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 16912 bytes
SHA-256: 06137a4009c89d425f0a3403708a1654ccf04c9bcda990e03a100d5fe0ef2cdf
font_01_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 11204 bytes
SHA-256: b9f82b3071cec940982ecdf5ec4a73ce2942b3902cae7366e1b5191b3258a835

Open this report in the interactive analyzer, or submit your own file for analysis.