Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd64c8498de36b14…

MALICIOUS

PDF

75.2 KB Created: 2021-09-12 02:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dcc768b6b40ba0b8db6aff7273f0c8f6 SHA-1: e5903a321baeb99925aa3da3d15459769b5f8e76 SHA-256: dd64c8498de36b143b4844540517e65a76e23a0410292cfd0937f376bcc2da8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://rutka.pl/media/upload/files/944fa0840ca60adc52b1350fc2738bdf.pdf In PDF document text
    • http://kovofilm.cz/userfiles/file/69514318555.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4545c7ada---81281972537.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/73205351811.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/14048044726.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0865f3833---napewazokusuwixe.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/lufa7deijanrpdrjojv12e02s6/mowolalejolabubud.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/wukukasafopelevazafokuk.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/27736001196.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/29038819738.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/lujuxafi.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613867c8a9938.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/5277052165.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/lokulafis.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/vupexawaleramovetodozo.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/wirupewezudanenakepa.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/tofetapabamunamowapuke.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/lobozasijub.pdfIn PDF document text
    • http://vidaleve.ind.br/ckfinder/userfiles/files/26578796203.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/37821935389.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210912055448.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397f205dc3f---nejoju.pdfIn PDF document text
    • https://dukupahit.com/contents/files/sidazujujolixorafexotifu.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf7f6fb3a---vaxobilenirefelasa.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/giribejupije.pdfIn PDF document text
    • http://electric-kernbichler.at/nuvonasuropanikogirik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=plant+vs+zombies+hack+mod+apk+downloadPDF 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_off0000c1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 11124 bytes
SHA-256: 5a6d2a13a0d3f459f6fed406cc966308585460825fdf3230f6fde2af2ee5a521
font_02_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 16848 bytes
SHA-256: 798e9dcbc7eb264e273b543ef08ab821ebaf78117406e4b56b40c762fc0791b1

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