Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34390ae8b297fd9…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 13:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f05dd6acce33e26221c113a379d3a3db SHA-1: 2dc432f2ddd3401b2030291b76f75e40ce801e05 SHA-256: a34390ae8b297fd9741eb2e70893a547af0638ce0b9fd813c2f021b5112c2127
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be to lure users into downloading further malicious content or visiting phishing sites.

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 http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b6826998---91800809912.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/vazobuxif.pdfIn PDF document text
    • http://boldogelet.hu/media/poxigoligelurowozavezisaz.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/52638955647.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/6850230515.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cff1b3beab---91186865605.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3b22c777---84697728819.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f0ed8f0fc---29073896070.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3aocld1pbancclmbqojv42njjl/18730758187.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/22521848966.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/tawepeko.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/67150371012.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210626010043.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/mavafuxutuwewakijal.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0001e7de0303fdf70597702fc9d76e1a/74585528633.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/11075971933.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/27125235560.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/0be5e9d56731d56da929c7e5f0eda579/5786572519.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/300257461265.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/jutemifezexovid.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608752bf13d81---93465587546.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/nisezusetijamuzobisusebaj.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/jefipakugusix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dravyaguna+vijnana+by+jln+sastry+pdf+downloadPDF 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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 11176 bytes
SHA-256: 534327f63e4c8d5dad0972e9a39254efbae8e13582a99972c77b6e3e80a01775
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 17600 bytes
SHA-256: 9bb9b0a6e7c5a536d146609598178a8588f5be32debce2a7e8a6a68d82f264c1
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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