Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b5e42bd11b03ca…

MALICIOUS

PDF

82.0 KB Created: 2021-10-08 18:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eedb7167a1e25edaeb4224f8cbef3d39 SHA-1: 5dd8e2dfdafc6cdccd554f33930af144e70126bc SHA-256: 94b5e42bd11b03ca412dbd9789c17da174a6e9cf0dcfda344ef65b310784595d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that the document is designed to host links on potentially malicious or compromised sites. The embedded JavaScript likely facilitates the redirection to these malicious URLs, serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pomodorolennep.de/gfx/userfiles/files/98109610027.pdf In PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/wamabowonutaxezaj.pdfIn PDF document text
    • http://czyxchem.com/upload/files/32364649651.pdfIn PDF document text
    • https://grandegroup.net/files/59028948640.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/54025435900.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/mikepatoje.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/19838472129.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210928_015857.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/katadosuwuwuwujexipalu.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/94815054377.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/sasubuxakiminoz.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9f5c0c270b83ec9800983a19efb6f6cc/jexorotudoruminasebawuwil.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1615cc102bc368---bepivotemukumulot.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/89393855742.pdfIn PDF document text
    • https://isosklo.cz/uploads/dakekudem.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/77549224113.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/pepezuxutepabonam.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/44149077580.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/36949666562.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e1a933c9ecd3841ed066a67d132590cb/sasiwabaxopobo.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/11215708772.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16156c2e8b91be---kotozalujam.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318e408d233---velatagajagi.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/19763639807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=44+gallons+to+litresPDF 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_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 19640 bytes
SHA-256: 4c9949094cde6e9f3e40c1733ac8f1d1111dc5fccc3dc853146057002e34ed01
font_01_sfnt_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 10264 bytes
SHA-256: f562ca467e31aa3a57d8b898b9b37ac6198523f5a22d0211c5534c6614151475
font_02_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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