Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a1feb4b34aa548…

MALICIOUS

PDF

74.3 KB Created: 2021-10-12 02:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ec4584593896249650bfc932baddf46f SHA-1: 78d2be312b243f4f1b1fdbc9c204695fdbd1b474 SHA-256: 82a1feb4b34aa54802531d145bfd80f696937649b71fda1a5f88c00d6fc9c0cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan distribution attempt. The document functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains. The presence of embedded JavaScript, though not directly executable in this PDF context, suggests potential for more complex malicious actions if the document were to be converted or if it exploits PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huyminhplastic.com/upload/files/68264412059.pdf In PDF document text
    • http://gursakaryahukuk.com/images/file/2401826221.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/80779828823.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xafipopeluxenikusagexa.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134c5481e07a---rakalovosimusasu.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/zubokasisug.pdfIn PDF document text
    • http://klaaswester.nl/img/file/37874499764.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6331700e9---22982749593.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/buzoxuluwapes.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/664fc7a6fc25f4f8ac611903530ba483/98215528749.pdfIn PDF document text
    • https://kawanmto.net/contents/files/rizikisuzideporodel.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/vopobebe.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/7303658975.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/jalesoponogila.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/neridunedipajeluwet.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/25590711967.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a3bd53f3ae6621e49da0ea1b44327777/79289905998.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/13120897817.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/13368808550.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/puruke.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/f121313a4d51ab7245f68e21cce1986c/25056032714.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/vufetawakuxopuderaratigir.pdfIn PDF document text
    • https://sergiomauri.com/images/file/taxuriwepofoxuj.pdfIn PDF document text
    • https://nls.vn/upload/files/57547376043.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/D9plVHj2VOU/uplcv?utm_term=good+paying+jobs+easy+to+getPDF 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_off0000c012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC012 10844 bytes
SHA-256: 36f6df9b7cfd7b08f56d8b307c249b592a545bb68b3b852b674859b4adb255a2
font_01_sfnt_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 16816 bytes
SHA-256: 0ea777826cb7913a616594dddaa785084d3fb3abd357ea758001efe35814f9df

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