Malicious PDF — malware analysis report

Static analysis result for SHA-256 9948d8ec30b24267…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 17:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3cf0a45a803d9c5340a0be96adf3bd26 SHA-1: 6ede8c8dc3c188094ff37c1724a5fe02bd7b6879 SHA-256: 9948d8ec30b24267c6a8659890c6d2584de929eb73058f526dab34e79ed3a8f1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URLs, some hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The document also contains an explicit instruction to disable security software, a critical indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://pixomot.ru/uplcv?utm_term=activate+ms+word+for+free PDF link annotation
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/nepodomuxifefu.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/wejewob.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f66c263d1---jeniverebefumudisabuwirax.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/jovimoberawuzatupepabidux.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/zuperojonuzedajofitabuxuw.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/vonivop.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/sadupizumotuko.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/71316653133.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161424d61e5139---fitusenivikupuvabura.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/57121956433.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/pokuxilatogijuvedivevu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162ce062c3---wosep.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/110317389415.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/pukuz.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/23547047231.pdfIn PDF document text
    • https://datajournonepal.org/files/gekexowamupatumigisalow.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/nopuvunu.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/13916176096.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/20055054101.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/newebukabonev.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/rekiziriw.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/24156578581.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/leruwavenixiko.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/3276623879.pdfIn PDF document text
    • 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_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 18724 bytes
SHA-256: 0964a64605b1ce1ed09068149cfd165a3ff3558270862a4d4d9511d06c03ab86
font_01_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 10620 bytes
SHA-256: ef27c8021f9055996e5a5df547d84b8975ef571d8fc0f3f6be1e52591ddff775
font_02_sfnt_off000130c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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