Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d974113ed9d6885…

MALICIOUS

PDF

52.5 KB Created: 2021-09-18 15:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4c8ecd4c3e62736d5fb123a8eb2b9ff SHA-1: 2ba1bb7a1b3b3a47328a84050f5fc316788cfcbb SHA-256: 5d974113ed9d6885133f0edac56de78fcc4a953888588d8e7274f051e4575970
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures to trick users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8694

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://ketchas.ru/uplcv?utm_term=11th+class+cbse+biology+book+pdf PDF link annotation
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134a660dd62d---22841032391.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/bowiwukorojuxone.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/minoxutijuvanatupugeg.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/bumevidesiraxedasa.pdfIn PDF document text
    • http://steinemann-ag.ru/gevejilaligatorekipinilum.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/fekesikujitex.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/31112701874.pdfIn PDF document text
    • http://keacg.com/upload/files/vozumuvakolibavezenam.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/47213644435.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/1904272817.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/66065988386.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/87738747026.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/muzajamuwab.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/jajewimulom.pdfIn PDF document text
    • http://remobudostol.pl/pliki/pabakidanufolutivilugoveb.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e15210991472aa1b242dce5220895cf/bodilekabusutu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f27aed18c---80306943785.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/67177948523.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fe49a10df3b5f4754d821420e5c312e2/96001607529.pdfIn PDF document text
    • http://exosushi.com/uploads/files/74644162411.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161419f5bea5a4---43155337842.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210904011802.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/tojadaxalimasisixa.pdfIn PDF document text
    • http://agama-rc.com/upload/files/bikinurolalix.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/80598363804.pdfIn PDF document text
    • 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_off0000ba0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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