Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2c41cbfe576adc…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 23:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 42be99f7ae1d16cac1da563dbb2fdc18 SHA-1: d29e4de2ad0df1c2ce51ad98e8a8d1df28886286 SHA-256: 5b2c41cbfe576adc3cd201573f2a82cd6b86eab8d2a787d5546f929d8227f568
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to phishing or malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://farmacieitaliane.com/documenti/file/60903636602.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2e3f8296fcc31e6f8697955cefef02b3/88881695722.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/54706055516.pdfIn PDF document text
    • http://i-physiology.ru/upload/vorixil.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/zabebiradimifirujibozu.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/lokodiwogegazoxidewib.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210908082120331675.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/75789602734.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/zedir.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/17432300057.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/77431582405.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/basuzegagefifufunofu.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/fafanez.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/99664487125.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/23346331167.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342ed3f009d---temalaba.pdfIn PDF document text
    • http://ihdbd.org/upload/files/fiserekufasuserame.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/bodovonesetezima.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/52795091409.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161436aff5c62e---6325078882.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/17251736317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=redmi+safe+mode+turn+offPDF 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_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EA 17760 bytes
SHA-256: 128447714acf3e9d156af08e3cc1501d51254b5fa9e994ddad14ff3e6771b447
font_02_sfnt_off00012ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 10612 bytes
SHA-256: 5bb1648cbdfff18cceb358c5b19039c22dc31fee368675c07503f9203be2c00d