Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3845052d8eb22f2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 18:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64f6d2f9b69066e3bf06bce2175d07c4 SHA-1: 6251bbb095e174c5026d5a9fa8b8157ee2d6cb8f SHA-256: f3845052d8eb22f26846ee991374a597f29672b4de3c970d8ed9ed83c165684e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a link farm suggests an attempt to obscure the final destination or leverage multiple compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maria-galland.ru/files/file/nimebuboxunuwazozositan.pdf In PDF document text
    • http://finalbrand.cz/upload/file/48715970227.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/sojawibulusa.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/60322212937.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/28f0fe201a8b0a504149d9d56bbd2000/regamumoridekosaju.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/lubenowezavikogobana.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/94437913986.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/84643847123.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/44671289395.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/xebebazitam.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109141838184799.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109021911161161.pdfIn PDF document text
    • http://methese.com/upload/files/54513729205.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141df86e4d27---3411413237.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/lejoxivenaxefuxewodeluw.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133592c7fbfc---bapinunofozunoxubeg.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/48237542519.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b58153a45ed703ac16a278d1d7efc104/63748745381.pdfIn PDF document text
    • https://profm.hu/files/file/85682772549.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/73197799973.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/nabogopumaligaviribin.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/13930571530.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/bisagulomuzekod.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/1846876900613981157f7e6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+set+text+sound+on+androidPDF 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_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 10472 bytes
SHA-256: 54c9ff5e761aed1f64cd8a0eb6ee38d3e75e957037d92f18ea36221dc42a16ee
font_01_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 20184 bytes
SHA-256: 721f9b170d74ae6d84058de313a1973e7a3b1ce3f28c6d6e8811cbd573bd72a1
font_02_sfnt_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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