Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7ad9973f1226ba…

MALICIOUS

PDF

60.3 KB Created: 2021-09-08 07:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cbe54cb57a26ce4ddfe7495aebab5186 SHA-1: 6a18564c1c9d706eda6b828c30c2c07d49697e6a SHA-256: 3f7ad9973f1226ba578bc712d1480313caa9575438578cfc8e1eabcd669c836d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8155

Heuristics 5

  • 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
  • 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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/10771abd9d7920f5ed84f0a944630761/jatagagasugijire.pdf In PDF document text
    • http://urs-certification.com/gais/image/file/25259066469.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b33a03e354700455a2c93e34492e9009/79630450810.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefizidimitebu.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210710_88AA6C65A199D39A.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/88458924613.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0a97009d---ratukivoz.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/mulanusopirefebanokavi.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210808_0AF4463C403DA698.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/fowofivageg.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c64cc0285ff99f8faa0bd0cf3f55a367/magetumuxugubovipaliti.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb26824207---girivodalo.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/2100339141.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff66c9cc66---58860644012.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/30223781287.pdfIn PDF document text
    • http://skncn.com/u/files/62891379835.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160825c3228ed9---63087895333.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5b3ebb2a---tezodilewate.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fcd24dbeb---43621847512.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092214874741---lemelabajagigok.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/361b9c8940b89f6b09a2c8334dde6ede/nurenokarobifitevewizi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qd0s729si9n605rn1ps4qvgtp4/52144097662.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zenuzipamolexapiwi.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a788456d0d7---rowozatix.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/pezenudafesen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tratamiento+fisioterapeutico+de+guillain+barre+pdfPDF 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_off0000c055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC055 16872 bytes
SHA-256: 431a16d0a29cc0b8420cfbf1299bbf326fa4af17fd0b85f67bf4b1bd063a4b64