Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ccc92c44de138d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 17:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ad27779bc0f03a020878df90dec76c9 SHA-1: 87017efc5e94e988a3007671a1e8be82a120732a SHA-256: 33ccc92c44de138d8a68aaec85ff397e21eaeaa9fd16594559b2fb06d640bd74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=time+period+of+sine+function PDF link annotation
    • http://malifer.hu/upload/file/torizanoxotovibivix.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/wefumatogaju.pdfIn PDF document text
    • https://avflash.nl/upload/files/konutariwus.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f679a4a900---57000665230.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/8449083549.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/38688079040.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///gelovawunu.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/gasazaga.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132634ac16e9---pudewatebiletuzokigo.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210914_CE503644A653C8AF.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/18659561954.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210914165408825964137.pdfIn PDF document text
    • https://ismart99.net/upload/files/98708767746.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/zekoverezowoxig.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/17396412675.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/titepagoxusume.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161420ee1a2024---80727244924.pdfIn PDF document text
    • http://cichanski.com/Upload/file/30117472863.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/sozinofosiba.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/16584073800.pdfIn PDF document text
    • https://ismart99.net/upload/files/4658604159.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/870297150.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330d349db5e---gitomofumes.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337f213eb63---94625899718.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/79842392543.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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 17648 bytes
SHA-256: 347a73c8127b36302ad4d1e74131e2606f5ea6b46a0ac125cd534087d2981409
font_01_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 10636 bytes
SHA-256: e076e438052658fb7dbc6f6af1dbb50c7108ba4e040735d417bbc7824eb04931

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