Malicious PDF — malware analysis report

Static analysis result for SHA-256 5288acf7f3b3b836…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 17:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5d0ca604c69e365745db05b55004d91 SHA-1: 9ed6d2fd7c994caeece1ce801ebcc8f15ad7bcac SHA-256: 5288acf7f3b3b836a267d0b89921e37491d574b86d5f76ab15989664b0a04c48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains numerous external URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate phishing or download further malware. The primary attack pattern observed is the use of a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=truecaller+premium+gold+mod+apk+2020
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/223c9624726ef3925e70a83a96c4c466/77712633386.pdf
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/28761122565.pdf
    • http://palaciodelosnavas.com/userfiles/file/libosu.pdf
    • https://znalac.com/userfiles/file/wosekideramefogafepu.pdf
    • http://to-kajihan.net/js/upload/files/88336936696.pdf
    • http://ziva-muzika.cz/files/file/11084793301.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zevudonal.pdf
    • http://bagiez.de/userfiles/file/rexap.pdf
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/74215828663.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378f085afdc---6822454875.pdf
    • http://koszyczarek.pl/userfiles/file/57640148288.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16134d84d02ad2---11980715214.pdf
    • https://bagstyle.uz/images/file/69922662274.pdf
    • https://avigailpekelman.com/sites/default/files/file/sikogilupi.pdf
    • http://dhleisure.com/ckupload/files/luzazunatafasisul.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/27505928308.pdf
    • http://engroupe.ca/aym_image/files/11520542807.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/61902781511.pdf
    • https://bluetact.com/ckfinder/userfiles/files/muzojujagudes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafa.bin
d62b886c0720bbd8d42c10f7c7955938424696feebb298dcd4891bdf9a9d4bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 10884 bytes
font_01_sfnt_off000103ea.bin
4edd98e33ee4c393ab0003d66c044f4247d77c6c93bfc352f0cdb60a8d90127c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 18448 bytes
font_02_sfnt_off0001346f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1346F 16792 bytes

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