Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da7bb0efd04580b…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 20:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61d2540e69be6cb63aec7176e101c946 SHA-1: de388e52c5acb7aaf25421f0e813eafcdc2284e4 SHA-256: 9da7bb0efd04580b3fac263fafae512bd29d5291bbe7d6cfe3978f714367678e
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of an embedded JavaScript stream suggests that the PDF may attempt to execute malicious code or redirect the user to external sites upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=the+cycle+best+loadout PDF link annotation
    • http://joyear.com/ckfinder/userfiles/files/88153199679.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/jofunilogawatozas.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/2662572967.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/60179147038.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/93044999133.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/gilidumudinulinidebepus.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/56503526213.pdfIn PDF document text
    • http://e-sheremet.com/img/bagokujonizilizivalor.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161312e8934d98---duzasixolakesuwujokun.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/60164192323.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/xexavawam.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/nisularelopokep.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419afce9e62---93529057303.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7c4bdfd00f439880fb52ef5ab769d2ad/ziverodofejavigojegu.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/22449307824.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/nomubuv.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/5061138494.pdfIn PDF document text
    • http://benetalent.com/upload/files/44438728287.pdfIn PDF document text
    • https://mlspoland.co/files/file/puxitejadevapusif.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/posoliguvo.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/70711265271.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613897b35768a---47726881106.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091606150573499.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_off0000ae3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64F 15168 bytes
SHA-256: df311413e89b604b3d0d5586ab1d56181a554d663da47dc24d914e73875265cc
font_02_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 10488 bytes
SHA-256: 9887371990bc510d247312c684fbf3f9342b7304df64f717c319c6a7f24723f3

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