Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b27dba5ad1faeb…

MALICIOUS

PDF

69.2 KB Created: 2021-09-12 23:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6363ebf2ec8f831ce55fcc56f4fd3de9 SHA-1: b86d7da77cd2f3ceace25dd545a9ab3839424a9e SHA-256: 91b27dba5ad1faeb8217039ce6ab05be7d0797e7efed084a5def2a16605b29c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://y3stwk65l-mn9.com/contents/files/564297725.pdf In PDF document text
    • http://lerucherdesanges.fr/userfiles/file/47261276499.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cc9677d9d---zukakumesuxajubojugu.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/69609779504.pdfIn PDF document text
    • https://digireg.si/upload/tujasapiwepizolame.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48bdb941e---punonabolesumiwobedan.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/falobar.pdfIn PDF document text
    • http://sinners-party.de/media/file/rovavinelifo.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/43514508418.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7d4519aa---87505798384.pdfIn PDF document text
    • http://szhlfz.net/upload/popoluzebawifikife.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/74979759599.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/xidasaragu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/n13ppalgnfav3lrtfcbm0hka35/bolinu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8788227e7---56235999363.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/togave.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/25010946424.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/kizopevavuxojibak.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/xunatuvuvutewodomebomati.pdfIn PDF document text
    • http://spharma.ua/files/file/maxobe.pdfIn PDF document text
    • http://turnyras.lt/Files/file/67504364811.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/43170411056.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/witokizugonivugazul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=clash+of+clans+unlimited+troops+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_off0000af8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8D 15220 bytes
SHA-256: 52fbaad1ba63f11ff81e3c19ce42a9e953ed8fd9ab11a4a4daa3e2fd13cc9030
font_01_sfnt_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 11016 bytes
SHA-256: b56935f78cd8dce3d426a6bd84206091b33548871d13afdbbf701d17e22d2686
font_02_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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