Malicious PDF — malware analysis report

Static analysis result for SHA-256 4121da660cd3aaa0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 22:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3dfd3b01e915156c8155590dd732ad6 SHA-1: f60694853599612f3aa5138c8444ab71b9220e27 SHA-256: 4121da660cd3aaa02e4bf8ec70ad0b1835c1387cb0d4c9048cc185f540843d7c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to phishing or malware distribution sites. The document body was unreadable, but the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=pdf+proverbs+and+their+meaning PDF link annotation
    • https://lawyerupsmart.com/tempimg/file/24777303671.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ippon8i7ntc76o0it2cpjh5g75/zokimofurakifu.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/sanaladobus.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/si5smahg0kle4jj36d7a1mfgj6/63555656521.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/325e86ccf720fa6f831b817018854e12/doved.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160788b1befa24---54622450900.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84ba31830ac5310ceea7ab473766680a/50538859718.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/5932994555.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1294df7ed---37349771037.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/gunenuritixorijikip.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c882802fdecd4d33743f893cd0bbedf9/82057355633.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/12286239087.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/607e9afb022870da5c6b7b168845170a/sowusotavetatakoz.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611af30827d16---tawake.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/10261250658.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-23/20210723091154803664.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d7f37db9a---87405356705.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/13299a3a2ab6737145b47ccf60bbe75d/dufupo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8c4898c88bcc8392cde243797d9a1c61/wulesowuzasederurogulebu.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/fukulususi.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/45949093239.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/99103682101.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2172c63a04dc956160a68448f509a845/57296946813.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_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 17700 bytes
SHA-256: 38431512fbf9724ac56231d387fce4683cb72f1c5d040d08e4f68200e12dfb92
font_01_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 11104 bytes
SHA-256: dd3c012a3e1b33ab3d204100f33aa6dca680b6b8a728774e24e3e0f5157ab6f8
font_02_sfnt_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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