Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd3f3ae3c02ce89…

MALICIOUS

PDF

86.0 KB Created: 2021-09-12 03:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 709fe6ebe5fba7f06b555f9ab3bd242a SHA-1: 7cdd320bc799df431b3b0837e64f2a700f7a3c5f SHA-256: 4dd3f3ae3c02ce89d17117c926d2e9024712593bb496c6782a816ccd603aebfa
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. Heuristics indicate a link farm designed to direct users to potentially malicious content, consistent with phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ruben.pl/ckfinder/userfiles/files/93088650256.pdf In PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/funuwazapagede.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/vupovilewatujotinibuluzi.pdfIn PDF document text
    • http://tano-cable.com/d/files/88448821068.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/xebekobozimesesitosubomi.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/xiferi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b2eba395---88494304938.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/waratasogi.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210908_CA053C3CE019B6B6.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/64523992124.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/68775880508.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161327db3f1bf7---82140695257.pdfIn PDF document text
    • http://greenld.com/userfiles/latujimexomadiramosega.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/jiwitokefot.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/24477435583.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/zixerunave.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/43345427129.pdfIn PDF document text
    • http://one9five.com/userfiles/files/97433841871.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/23231956083.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/wobepububuxa.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/ritug.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161366d7879aad---60124875079.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/rekovibesipimupatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=3d+attack+on+titan+gamePDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/vujagamelozonedokogidipog.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_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 17864 bytes
SHA-256: 0bb9b6a958560c8f02e5abc236fd2d418d2498f1c3373c938f0562d7df5a6e49
font_01_sfnt_off00011a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13291 10568 bytes
SHA-256: 9734b61785072fd80c1ec50a45eb3260f2ebce69b7be2a5f2880ee896878ef1f