Malicious PDF — malware analysis report

Static analysis result for SHA-256 8176d8bbc422d950…

MALICIOUS

PDF

121.1 KB Created: 2021-07-22 00:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 379e4c020e38191656c8edb89f263d99 SHA-1: f2a8ff5e61c50422c0c60ab0cb495e73cd172dfa SHA-256: 8176d8bbc422d950e5c9a668301874ad51e06646d14eb41adea07581b8d39690
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the execution of malicious code or redirection to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/sdahhf2v8khi3jof0jknsl9122/21871170549.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071218523f5d---jalatuzafedovorowubaxo.pdf
    • http://antwerp-reefer-tournament.be/argt/files/26831338277.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160946d707d3c8---manidonikunovukile.pdf
    • http://trendymamy.pl/userfiles/file/20923541709.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210503021207318624fel0of.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f3681314c---10019768340.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731cd0b574a---fajarolozugudateda.pdf
    • http://stolizstekla.ru/userfiles/file/gomugonopazakevovogu.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082264764de2---89034249660.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092247d0b217---xuded.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/64013351433.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/bf4d1e67de52165c1ad5ae9e2e8f1dd1/bajivuvotakajukobe.pdf
    • http://alpha-cp.com/userfiles/file/49732575283.pdf
    • http://jullien38.com/ressource/site-image/files/wepoberawizoparonano.pdf
    • http://poltinik.ru/userfiles/file/20174976816.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac4c69d683---13934431140.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c283a9ee4e9---21794469605.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607992b1afbdf---guketilorobepabitewezeji.pdf
    • https://mvpartners.be/images/uploadedimages/file/26041194626.pdf
    • https://qpshouse.com/upload/image/file/4686579457.pdf
    • https://xlspandoek.nl/userfiles/file/20262624469.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160f3656c6be1c---fotepivej.pdf
    • http://thecreditcrisis.net/clients/73966/File/10499033173.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=text+identifier+from+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015d7d.bin
65d2db144c93b891c93abceb9cadbdce46e75894cf1fc40aca2f2412ebf6d896
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7D 16200 bytes
font_01_sfnt_off0001734a.bin
72e75ec1e314326cd24ead103f75bf5168992dda6f9e0035f827a3390f2bdb04
pdf-font-stream PDF embedded font (sfnt) at offset 0x1734A 18676 bytes
font_02_sfnt_off0001a557.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A557 16792 bytes
font_03_sfnt_off0001bd6e.bin
686262da144d1d3f76cdf3f1b1ea5bf5fd90c4c602d578e4ce118f11175948c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD6E 10348 bytes