Malicious PDF — malware analysis report

Static analysis result for SHA-256 836bd190a6e2413c…

MALICIOUS

PDF

86.8 KB Created: 2021-09-21 20:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b6791da954579ffc2eb61e3ba9475e4 SHA-1: 831c9b40b6d1df232ec60bdf61acf1a2ca38bd15 SHA-256: 836bd190a6e2413c85be2c1d75aada1c6e28083a543fd573879446c991b3cf04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using such domains to host or link to further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=download+nulls+brawl+apk PDF link annotation
    • http://jyy.jp/ckfinder/userfiles/files/20210921_045035.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/29743770558.pdfIn PDF document text
    • https://latework.cz/soubory/zajetuxatev.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/gafejenabedafukapizipe.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/78559332505.pdfIn PDF document text
    • http://domainecomps.com/documents/files/wasowosimexipukabagijad.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/rojenixariwu.pdfIn PDF document text
    • http://trubaopt.ru/content/file/liboju.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/40598147167.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/82419724401.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/54484029649.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa143b18a4---kabuwumanojevenis.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/bijepebuzekadin.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/jibufujuboba.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614358ca65e50---wilatawimetagupavuleletak.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/52511107234.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/dutigasuputiwuduza.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/51484307530.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161327035de646---punupojixafuxowosesadupa.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/7711592500.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/51659409732.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/92586359506.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/98661936377.pdfIn PDF document text
    • http://eternaseguros.net/files/files/poleduvilanemirisumak.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/26515220414.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135927e09c88---wabajesu.pdfIn PDF document text
    • 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_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 17592 bytes
SHA-256: 2527a54f9d612e5d296324b9a8681a85a2405f6be8c88ca37f454dd48808e252
font_01_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 10480 bytes
SHA-256: 2ccd99cbac245759a64eb8b4af6040073275fd5dbb4040244b3cf9cbb4c5300a

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