Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c3d3307e3f5a1c…

MALICIOUS

PDF

72.6 KB Created: 2021-09-25 11:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8cf9bb3a9bc0c2e7c892b968e559ffa SHA-1: 5dc9fb31b2dbe338e8df70216ec6c1c203aa556a SHA-256: 95c3d3307e3f5a1c9a93a73dfc4b9306691421b04b52d1e1505f45feb8655ae5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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 https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/v32g69q46q96b62b52ljmocrt1/55830149381.pdf
    • http://tunglamgarden.com/images/fck/file/34897885383.pdf
    • http://video-cycling.de/files/file/fuwira.pdf
    • http://jyjwqj.com/uploadfile/file///2021092217022491.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d68e9f57b---benipizifovonojema.pdf
    • http://xatrbio.com/userfiles/file/zibatifumowajo.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614501b86aaf7---lasirezedagidat.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/vorejonavom.pdf
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/tukis.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a728b9ed8---lazuvuxenelawuto.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/95814520216.pdf
    • http://www.allatpatikapecs.hu/images/file/dosenuwewano.pdf
    • http://www.urbanwaterways.info/files/47385996351.pdf
    • https://gangnampools.com/contents/files/51715298318.pdf
    • http://dj-venci.com/uploads/pages/files/nonusedexav.pdf
    • http://ontis.sk/editor_uploads/system/files/91329758482.pdf
    • https://eobliecky.sk/userfiles/file/luwoxazinokitiw.pdf
    • http://changzhou.chinatupai.com/web/js/ckfinder/userfiles/files/45792915312.pdf
    • https://santa.my/images/users/00000000/files/letirubizuzalotufiteb.pdf
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/wijedipazaxifowe.pdf
    • http://ranch.pl/files/file/jizekuwasemivaboxoxediju.pdf
    • http://praxis-greve-polley.de/web/editor/files/86302881668.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+change+password+on+phone+if+forgotten
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6c6.bin
2d8f1916b4d5225b05b3868609d93e0a89b98450e8e53c052003443132f471e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C6 10932 bytes
font_01_sfnt_off0000cfe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 16792 bytes
font_02_sfnt_off0000e7f8.bin
a43f4ecf4759f9e773a496ef57692715c2ab5a092ae19d089b75dff9a8d825e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 17596 bytes