Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c13a16b0ed1004…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 02:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1941fa523baadd257fc2796271516a88 SHA-1: 3b14337cff0afe8442b4f4e644588415d45224ee SHA-256: 19c13a16b0ed100423c526ce2bb117de4b746a2d3095425f3abc95bb2fa24724
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a likely phishing or spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://saatyapi.com/upload/ckfinder/files/31109307865.pdf In PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/novavi.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/52049372322.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/25034668286.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vujojufefutunivuwilepovof.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/dotusinad.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/84940904978.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631026640.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6095033f584170a73041ac2f99cbacc/48410994169.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/63913968199.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/78730821276.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/tefozovaka.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/13442904956.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/da275254a05e7b02f737703cbb3233fb/88924599027.pdfIn PDF document text
    • https://seger.cz/userfiles/file/lubore.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109010603509842.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614913391590e---surajugigazedosanun.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/52455665460.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/vesazexelujofutuzusa.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/bd99c49d1d8b4a14c32ae82ac73bbb8f/kasilijaremewi.pdfIn PDF document text
    • https://fobh.net/userfiles/files/11000394256.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161490918777b0---71035551067.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146c14dc11a4---69191884910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+close+autocorrect+in+androidPDF 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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 10540 bytes
SHA-256: 7dff3eb08c4e3d666867efa8e17ce00a66040042a385f3ba2741c8adddd2d9fa
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 18996 bytes
SHA-256: df26a24ccc357cd475489f17020b9a89a7d79df3f8d10ded578eb9e19424f985

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