Malicious PDF — malware analysis report

Static analysis result for SHA-256 e085aee063d1b206…

MALICIOUS

PDF

67.1 KB Created: 2021-09-28 04:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5daf981550f8bc7e0220f7e979a3d38 SHA-1: 12aa5093f9751e27b63559246cd46a8f016c9426 SHA-256: e085aee063d1b2061f2da72a75b4d2cadb042f59877281de917a23993b091aa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f61b736d06662bdcd2fe7498af65f867/9551370250.pdf
    • https://globalcircle.club/userfiles/file/silixu.pdf
    • https://soalmatematik.com/userfiles/file/3646313.pdf
    • http://luberoff.com/userfiles/file/46351601707.pdf
    • https://steammining.com/userfiles/file/89178360481.pdf
    • http://clean-ecology.com/Upload/files/5685717377.pdf
    • http://www.iece.in/userfiles/file/35763034623.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161496cf40b454---jubeba.pdf
    • http://brickform.cz/obrazky/files/24060223523.pdf
    • http://teplospectr.ru/images/files/44863161748.pdf
    • http://sage-chem.com/image/files/20210912_010516.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/32429266821.pdf
    • http://emrc.ie/upload/imagecontent/file/99808267660.pdf
    • http://xn--aknmedical-yub.com/uploads/file/delem.pdf
    • https://girl0229960192.com/upload/users/files/75918098929.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ca59622b2---59689877786.pdf
    • https://parvazyab.com/basefile/api203/files/zinerimi.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/hje1ktss898hmqps9mbkvcerh3/65060891204.pdf
    • http://mybyblos.com/userfiles/file/20614701734.pdf
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/riruzeduzorujekerasevusij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=boiler+room+movie+free
    • 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_off0000aa7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA7F 16792 bytes
font_01_sfnt_off0000c291.bin
d3b3e19bcf6d30277f9fbd3c7704a71bb8e12b1027abb39685a828a7608faa83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC291 15320 bytes
font_02_sfnt_off0000e963.bin
9f487229cfcfb96c757f3c2005d39c85eac3b772779155f145887698533cc619		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 9960 bytes

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