Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ee6aea03afd4e7…

MALICIOUS

PDF

93.6 KB Created: 2021-07-07 01:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b28ffa7d9e2eed883c97193b0302951 SHA-1: 69f6a0f2eafb9016ae95fa5d9e9bc9cb9018a480 SHA-256: 45ee6aea03afd4e747c428dfd8ffa6a9fdf2faaf9a595d03b10c065a141fa484
156 Risk Score

Malware Insights

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

The PDF 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 compromised CMS uploads and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://tandartsindex.nl/images/uploads/winuwuxemifabixujeve.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6ab58997dfc6a6a5c749b940de1cbd63/werajiputubajexorofoni.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f863f6167c---baxemok.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/sqa75e61ku8mlegd5f0h38o0t4/lulalopugumaxaluma.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd664b1f6e---43912621429.pdfIn PDF document text
    • http://lawngo.net/fckfiles/dulopagonege.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/sexaworajum.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c9b900b3---gijebemaguludovadevi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eda260458---tometiwapimemonegoj.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/nizamiwepojuwegomixogoju.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df0c4b930ec---51317471921.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210529182207_d0j97f.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769ac713f6e---wivul.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607271869cfd2---lokisuloduvob.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/89923728890.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce0a131c5---95201287910.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/vubarakatulozesuvij.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/funilogejimaboter.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/57100363237.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/492cc67a63540c254f0ae87937a62802/57210242604.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/694fbcd2f84fd29ec4dda7683a021646/56131349885.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lefovafex.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/b1d93c9b26edb324cda245c44fcbf8ba/tafabavos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=in+isosceles+triangle+centroid+and+orthocenterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 18672 bytes
SHA-256: 525c9d975ef39cba4b6144d34eadc17d854a100fb0a4f6c830a448df72776772
font_01_sfnt_off000122b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_02_sfnt_off00013852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 10600 bytes
SHA-256: ff9b0b49a54493273ae4e5a4377140b818f2674b7a8950dfd3e32c826e58b190
font_03_sfnt_off00015040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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