Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c06c00b6f5906bb…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 11:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48b95673a45a28a3c62dac2dc745b1f2 SHA-1: 27a633949f750c86e6a3ed80e5b2d8dad30ebe26 SHA-256: 5c06c00b6f5906bb14e46e33249746f4f9325bdbb5891d29e757d66321c166e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=gattermann+reaction+pdf PDF link annotation
    • http://www.florentmaussion.net/userfiles/File/22489551171.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/poweped.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f39e4a5fe---24647981159.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b23fd283b61---pawotosuripafojatavom.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/264c8f575b0ed17b1bf648f42945e144/23802387687.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/gkmqdbe3rv3ib5r1rok1fn4q0t/jajokuzudunajetodotiwuver.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/40910518703.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/67525342949.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb185e32a---54218588582.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2402d20c5---25165015021.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/gexelosaxukujone.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/jopupiwaja.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/kogexegixan.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/96448343860.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/lekiraniwirigumutefikotu.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/57275169857.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d6ccf573---pajigij.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/77323571844.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/ce3da2f564d3e2b176a9ce636bf6bb61/newila.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/jimodoxurelejemu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16118facadeadc---17005278082.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/50037338962.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_off0000d025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD025 17248 bytes
SHA-256: 6f731114cee52162285a6e687da97651b3f48918970befd0073d4a929af07f75
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 10604 bytes
SHA-256: 8fc658c675cdcea4c0ff212a2e13998adfbc68e5e00e3f082480218176c038d8
font_02_sfnt_off000115be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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