Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbaeb12394b19069…

MALICIOUS

PDF

93.8 KB Created: 2021-09-14 10:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46c914ee88f525861962dd60c7c9bcce SHA-1: 490d2dbccb6c3b58345525849fec2d1eb7f462c5 SHA-256: cbaeb12394b19069a159caf020141a279bbe2a5433ff7ae2e806424a9ae12d5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://underworldgear.com/admin/images/fckImg/file/jopejariferalebujutixot.pdf In PDF document text
    • http://dissanna.com/temp/fckeditor/file/xokowikafitigamudu.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/mejisiro.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/54178491262.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/23861408755.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/49020382170.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/wapidovikepuwokuxitunag.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-2/20210902044844106997.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161359f4d96bc7---xizogupuna.pdfIn PDF document text
    • http://findusafranchise.com/files/files/tejemanimisugaparotewot.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347dc3e44bf---sotekoniwijugewenuguv.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/29706709374.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb2cd5b28---60738778717.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/id95mfbn4dtkvd6lkep8kkpqr6/lutasadekawejoj.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/lesozalos.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/gugoxobuvasoritugajevu.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/zizox.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/bariwepod.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/telonej.pdfIn PDF document text
    • https://rajakedua.com/contents/files/55733877828.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210907_D65B27AAB4660084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+18+dragon+ball+zPDF 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_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 19552 bytes
SHA-256: f619e01be30beaf8e66c5cddd54965c3e3637a355fb504417a1664bbb1278abe
font_01_sfnt_off00013a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1E 10464 bytes
SHA-256: e99d2c904ecb05ea3fca216b56c52854ed0c2c677bab74e386fd34c801761ab3
font_02_sfnt_off000151c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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