Malicious PDF — malware analysis report

Static analysis result for SHA-256 3723872a9a96dc67…

MALICIOUS

PDF

70.8 KB Created: 2021-09-18 22:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e8eacd337014499a9f278022a4c7cdf1 SHA-1: 2b277a17ecb72d1769412f8c2a86e4ac3f9a8205 SHA-256: 3723872a9a96dc6792444abe8790efdd7e136e879d5e85ceaab796af62735f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=word+chums+coin+cheat PDF link annotation
    • https://marwaautorepair.com/nbloom/fckuploads/file/5890056922.pdfIn PDF document text
    • http://jaqalsports.com/files/file/xujilezukisezevoz.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/91458207744.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/64315296859.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/27204987319.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/29821437022.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/77498242073.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/16911190655.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/10301987547.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/kerogupuxojuwowabiwowilu.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/440533569.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/lno4s7jldgib7c9duda5vjcn83/widirovujo.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/47684487877.pdfIn PDF document text
    • http://momsystem.ru/public/file/tumapalom.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/3716687149.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161355e8df3c00---gowazamoremam.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614283798d882---kewag.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/lukagiripubedokal.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba207a607c---zumitukafusixadewuz.pdfIn PDF document text
    • http://pololanna.com/user_img/files/13147555659.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/21847348356.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/45103323103.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/gadikoj.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_off0000b4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FC 15820 bytes
SHA-256: 149fcdd61c2c5c16944d562773d3deb231446e69b26db796a5adcd008d861380
font_01_sfnt_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 10684 bytes
SHA-256: b86ee86b6f8ffbc22eeccfb0e896ec61a48a85a2e98ac86591a87f8127adc29b
font_02_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1