Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd33763771910ab1…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 14:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8057e386b9a50b8df2afab5467827a49 SHA-1: cb4d03479e70a14aaffbdfbc630ab7d8c0937c2e SHA-256: cd33763771910ab100c356bfb2b43b3891242ab2f08fa867b594d8546780f035
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://creative-format.com/upload/editor/files/6091343714.pdf In PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/65b179e4c62178def443e3b6813616d3/49126435188.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/21268844897.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/17713057755.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bf17448be52b029e5a2c0198c02ede37/duvisenalozad.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/eaqdhdl6jvts2khjc87fgo5ner/38752462902.pdfIn PDF document text
    • http://veribase.com/E/file/timukidibatozagojudepiker.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/bedakilijesotugixijajabut.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/62459840690.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b489a8a9480---zakelusetazejitoso.pdfIn PDF document text
    • https://renetravel.ro/images/files/rasoso.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dae51d3848.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/26161359246.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/10858227009.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/xasimud.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/ximeduvikanamudi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/36nptr3h0pneae7hlhh82bk4d5/jowolosulidelajel.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7f91e6eac4a59749cdff6ad030f5a8d3/sagup.pdfIn PDF document text
    • http://rentaruedas.com/files/others/zinupumumisalesonodew.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/98ef42cc82f389a5763aaa0103af356f/pixakijer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ic+engine+pdf+v+ganesanPDF 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_off0000c9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 10448 bytes
SHA-256: 5e2925046654510977be9167dd9fda61d0f326d27fad3f40c4120ff6da014cb6
font_02_sfnt_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 17764 bytes
SHA-256: 370e61cf94978eb578e38fd5a381e0a17a1078f7abca4b961bcc2b1a00884551

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