Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3740c969929d66a…

MALICIOUS

PDF

244.1 KB Created: 2021-06-14 11:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9862bd9cc8aa5e518a1b774c3eda9479 SHA-1: e942bcab66fa99d6412a4982da839d8e2d62fa32 SHA-256: b3740c969929d66ab9b382a3d5930d2498cfe926f1cd8a0a3b12a28a5b71a464
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URLs, including one pointing to a compromised WordPress upload storage, suggesting it is used to host or link to malicious content. The document body, though heavily obfuscated, contains text that appears to be a lure, and the presence of embedded URLs further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=give+us+the+money+oxford+bookworms+pdf PDF link annotation
    • http://vimbark.sk/editor_uploads/files/moruvajaludavosopodake.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f6d2b9f9dd43ca247d68709cfa67ba49/mafulefudoma.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b656a3fb26---70854553547.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/88816352433.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16070c4b3eb774---tuginevuwimidebeba.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5d7072ede5ccae39a06d6edfebaaf069/25449278632.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092fdf1ea901---jikiwubetikavo.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082a3a78d0ae---65447576602.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/da3dc27d6c1575042c440517ec56dd1d/16294147129.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92d3d876b---levafemofekegifugazejaku.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608850e2661d1---35991435400.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f511d459---12254752029.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160995ed96b87d---20980292941.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3d8d8bac7111c6985b729bd2ff70c492/93772487350.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3e6f816dbac0af5e2dca97084dfd45ad/74368748167.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/709e89b3762efc1a3aaaab5134e73268/rosafasut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00035717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35717 5596 bytes
SHA-256: 40cbe8c54a282ed0a1cbff90e052e63662e4dd15d8eefe36514792136e7f32c0
font_01_sfnt_off00036a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36A16 20564 bytes
SHA-256: bdf0e5e900e40651265c1cf417d4c8273dc4988f60b8487d94fb9ab9f0b07501
font_02_sfnt_off0003a99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A99D 16316 bytes
SHA-256: ffe4d10f7c11f5e7320bbd71225bf9496e5192aa5ea71946dd08c479e8e510cc