Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95fb69c20175469…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 18:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e5ed911d519929bca6aa7d4b7bc48551 SHA-1: 8b6a002cec16a337ce648e091f94c71e2c50f715 SHA-256: b95fb69c2017546926932cb7de8da2ae764f33fda9d72b60ec158c4122d56c87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs and link farm structure suggest a phishing attempt, likely to trick users into downloading further malicious content. The presence of external URIs and compromised CMS upload links indicates a distribution mechanism designed to host and serve malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=download+foxit+pdf+editor+crack PDF link annotation
    • http://aal.tw/uploads/htmlupload/files/3114823546.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/67801724966.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/48522234604.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/foreka.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/28596958622.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a2bee5e80---99833972419.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/gemifewuge.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d2669865912da3a97660045adaca06e5/vunowagoxuwumiruj.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/9hgtnjrq65g2b2b3ceb9mkbvht/gibawefojebopebolakepiv.pdfIn PDF document text
    • https://subarini.ro/mm/file/58639981515.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/18405300364.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe3e38561b---lutukilopaxinexowiwelam.pdfIn PDF document text
    • https://agermag.ro/mm/file/13264333084.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/65428671991.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fde7046c54d---puzakuxuvomese.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/nupip.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c2eac7423---3765915379.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/4kas94mdqpk7bi4bh70rr7q261/71686953598.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/55648392187.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/11108714370.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/867293111fb17b19743d657da300a2b8/39210950476.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/dedazororigawibibufefume.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/43809037074.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_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 17460 bytes
SHA-256: 8112a823051c03bb389a7eed752d06cde83f614c7a573e4e3c25a5436ff5a51b
font_02_sfnt_off0001231d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231D 10728 bytes
SHA-256: bb6ded6310b2e3f406f63d2d561600d364ac8fddd0681d6d78798b51ba5659b7

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