Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be1ca227819def2…

MALICIOUS

PDF

84.3 KB Created: 2021-07-08 09:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7bbe51f5d13fa85481182da32ea0d8ba SHA-1: d5b452eaf905eb4902302984894cb6d761e3a41c SHA-256: 6be1ca227819def2efaddcf0995d5b6766eb581294a22054bedd1de0b8ffa138
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://netinflux.net/userfiles/file/fesaveluxunobife.pdf In PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c53b4655a---ludevuledelikafawe.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4b17670e0c6c0419e49609ff55573dc8/femuwametalaniveledabu.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/wenexurujelezoliregezusa.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/31584412749.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/99378990340.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/22437248200.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a13fe9cbfe1b0cb7755dbdf393c0c97a/zopiruwugimisoromil.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927bb1375b6---jowasatukaziwejabor.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210624170119.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/xerena.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sizatotodepefedamusedo.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/74334475265.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aaa719eb3---toposubejilaveserirus.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7539595ce1---60484992820.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f8c046d18821be4075f521ff8d7014d9/zotajopeponabuxozosid.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994213bd8ee---tanapibojotumap.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74b3ea8de---wugexenezefawevusugojoxi.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/39197837445.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/77494046810.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/nojabokomisiz.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///2611625703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=real+time+with+bill+maher+2021PDF 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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 10548 bytes
SHA-256: c2ece565c566c8f1bdb21003d0dee2d9186cdc480db28d9e931d6f43a2e25b4b
font_01_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 17780 bytes
SHA-256: 3f06410f60cb85548c15a5770b5db8c44a2feb0cb625dfe5571b8ae4af84c3f5
font_02_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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