Malicious PDF — malware analysis report

Static analysis result for SHA-256 b515bf35e17e4d48…

MALICIOUS

PDF

99.1 KB Created: 2021-09-05 06:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59c79e9c960a03aed331c2681cf53c17 SHA-1: 2db1ca5991497b8053d436e9d3bc37505df0ce23 SHA-256: b515bf35e17e4d48966440e6f93b9a29cd66b7270299d83b91baf48a8740d971
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/20d2f380e762846787650c130b31a6d4/22668626176.pdf In PDF document text
    • http://epwuae.com/userfiles/file/loliko.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a38c873dc62b6c471d5ed0109f42dba9/49201209218.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/thk2ivht894c6frg92kslsei1f/ralapobep.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/sivamexisatetewuwapagok.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/65609056381.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/22003693807.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/kajupetezedusilegisaval.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/74308110654.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/c824b0c71ba2a1c3d868044d85c54871/34603455530.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/84330785991.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b88356405163c0a4a8e85dd7709debf4/jovujawi.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/87b4e6b609bd65e8b08363a3636509d8/bezifu.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/8639305237.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/webam.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/wakegupakuropadafizesi.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/21257603830.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/99910884997.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/46441549808.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/3932607789.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a55a1d96---fijonan.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/21142618177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kazan%C4%B1m+testleri+6.+s%C4%B1n%C4%B1f+pdfPDF 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_off0001209a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 17816 bytes
SHA-256: 58b02f5dccb3cf8920b1f5c95ae0b0bbf93bf0ed34c89c43746c4025565d1b38
font_02_sfnt_off000163bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BB 10868 bytes
SHA-256: 6819772006c6137ce04ee82e0aa1e74bffc0392ff80d0c3ad63210089f1546ae

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