Malicious PDF — malware analysis report

Static analysis result for SHA-256 925859601e83b1a6…

MALICIOUS

PDF

64.0 KB Created: 2021-06-30 03:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aabfc494f23d40aae87a67a1ae60bfa4 SHA-1: 5b9438b396e8c58cc30b0d09ec009fa855d8c29c SHA-256: 925859601e83b1a630f5664febf84da9576963ecb1885bda1949beae4b75b9c6
174 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, including one hosted on a raw IP address and others on compromised WordPress installations. The presence of numerous links and the use of 'utm_term' parameters suggest an attempt to drive traffic for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7086

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://romanakladatelstvi.cz/userfiles/file/navilekun.pdf In PDF document text
    • https://fwullong.com/upfiles/editor/files/denijemowopa.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6dba4f3a---dipexazopagezarusavow.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210609030351_w58gko.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/81693323350.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081467eeca36---wiluwuneweliginikoj.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f54accb66ef62c269d4c333f363604f5/zidokusubevop.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6acdb39e8ac1c8000d6095d23a01d87c/28113456611.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b9d731c1b2f71cfb8b2107f72b0c811e/91150453063.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/boxabalunelusulobuxumedo.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/67470672869.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210613162844_kn1xs5.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/b30474586dc988c96c29efeb83941f9d/746672153.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9753b6bc19---sotudusumexenadunidoporaz.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/28525091019.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/43891808287.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/19467606435.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607916027b740---wovurugewabipufinuketuk.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/030vngopf5oa98c5im5gss9k86/82254562913.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/dc071a3d3499b50b36916abd7f881d40/64252980734.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/25130702552.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xutumipuwepopivenitokubul.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ce76c7e879ec1eca48fad32545462982/67450385170.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2dfecebae---vepikeju.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9ec9c0376eaaee9414a8542552ada088/wofeseza.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16087e767ea543---60722296106.pdfPDF link annotation
    • http://www.cavice.fi/tiedostot/files/97543837603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=baked+halibut+recipesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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