Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0edbfb9effa46c8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 17:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d921cc38c1b00e0a158b0d54d3a7da6 SHA-1: c85a69835ce3d61d01ed78b6b31f85a0e5755d1f SHA-256: a0edbfb9effa46c8a0f10108eb276ed4da8b7c4b7f425ce4847759638f9f745a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many of which are hosted on compromised websites or use disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'utm_term=download' parameter in one URL further supports the lure of downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qap9ammqv9hk6sb29v70i9khs3/27328249546.pdf In PDF document text
    • https://isitekmuhendislik.com/userfiles/file/86386513549.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://qdsenfeng.com/data/files/48030639782.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/jowozepox.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/rexogopoxum.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/77681279525.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/76956404772.pdfIn PDF document text
    • http://kaies.net/upfiles/file/fedevukigozutobobup.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/30174703865.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284866a920---lisirelazenetonil.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/89179817241.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/365b57c96f1dc80d51057e61d2cf7d31/kufes.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/vavuxelobuzono.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/rakuwifex.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/luwegosofuko.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed113005d4---78710057711.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d6c4b993b1e0515798371e0358ba17ea/30675166790.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/faxujewurog.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/58404746171.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd3b07914---55038714725.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/pumepu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd5203746---51571157463.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/13411329856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+euro+truck+driver+modPDF 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_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 10708 bytes
SHA-256: 90eaf5f0f7f397dd41a503e0c1eb5c30655fed4a6754c578600145b7b979d8ca
font_01_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 17144 bytes
SHA-256: 7057ca2775096a24342266c86fc5e092d0cbdd6871b0421a88477a3eeb636d1c