Malicious PDF — malware analysis report

Static analysis result for SHA-256 222d881a8bb75376…

MALICIOUS

PDF

94.7 KB Created: 2021-09-02 21:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b9272b9f9e851383ea717fbf1baa1d0 SHA-1: b83e2ed29e31a95373b307c93941bce4d51ea50c SHA-256: 222d881a8bb7537640d58ea8f46ad7450f201aef19ad1166336f28d1b4fa52d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'link farm' on disposable hosting further supports this, aiming to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=hp+pavilion+gaming+32+hdr+display+manual PDF link annotation
    • http://loveperfectionschool.com/upload/file/69706252412.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a51e27bb74e4cba2f119f6eb98651572/tojoxozofasetedonifides.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9acae6f532---34148592717.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd98c93051---2802545671.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7f121636---81197612433.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739b2bc47c0---64354812112.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/57608623311.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607410d5df702---xazawiwibaguweleda.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/7359226672.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/babc2efdc41f06c1948e50ce7bc4d425/vapajiraberul.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/tetesido.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9d6598236d0ab5dd93c44f5d03ef2861/20733640698.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/99268606777.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e699a5a0d---88443335610.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/19991926442.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc6cc0917---77685660730.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090202b50a23---jefegabaxej.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ee93a8cb57feed5b11ad28ba598d4174/jiposisemamiwepali.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/3332894922.pdfIn PDF document text
    • http://fitviewer.de/files/file/loxifulenewifegovewavinur.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/63660944622.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jluqv6h7oh20sf9kbp6qmap2hc/53424962321.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_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 11172 bytes
SHA-256: ecd76fdc8b2b4e5aad986e20eb0c38d908eb4747fe596407af6dc8d2bbf15b40
font_01_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 20032 bytes
SHA-256: 0d6e37297e5c6d7c64d0ee4228f3dce99105638092e1fcc3b6121b8d540b3eff
font_02_sfnt_off000153da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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