Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0d607591e41deb…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 04:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b7aba2dee0c15ff53f2b2f12f0d2e3c SHA-1: a9e7cb520db9ccc16cfa07882ec4fc029298e1fa SHA-256: ff0d607591e41debe768140a669ea5e87ef277a01345053c23e8e5ce2f6003c9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external links, including a link farm hosted on compromised WordPress storage. The presence of a 'download button' lure and the ML classifier's high confidence score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicate a malicious intent to trick the user into downloading a payload. The embedded JavaScript likely facilitates the download or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=universal+adb+driver+device+not+found PDF link annotation
    • https://27061010.com/uploads/files/202109112304553823.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/69265669334.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/petajuresi.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/55128416020.pdfIn PDF document text
    • http://land89.com/ckupload/files/24014155967.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210914050903_mpyuuu.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/povegebojezezixujebixixiw.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/47186301364.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/fuzinowuwe.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/zegolu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dacb28213---zaxubanites.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9e8039bd---wolonares.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210905150921.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/lazamagudojoj.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e92fab119---20474476574.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/65378966234.pdfIn PDF document text
    • https://akvaguru.hu/user/file/17150101253.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/10631121087.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/27800086751.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/telawuzufe.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/59849273390.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/99356154901.pdfIn PDF document text
    • https://domilot.com/uploader/files/26331693514.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/22325210792.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/jedivipi.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_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 10784 bytes
SHA-256: d0fd10de6bf66d24494b4cb5c3c664d1d739431c3e7edc3cfe4b26d4c46b3a9e
font_01_sfnt_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 17240 bytes
SHA-256: 7d20d5547ae235e938d830506dccd8029ff3f71819a54076dfebd2c8503b7344
font_02_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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