Malicious PDF — malware analysis report

Static analysis result for SHA-256 700337bf76663d49…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 00:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1dfec47653556852f20a90b58793c72 SHA-1: 3b51f3f0e19c7d51eec2007459c0f8117e0585d8 SHA-256: 700337bf76663d490871d377a7c6e87248895cacc29e121b7bcd2fbbac810f44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing malware or facilitating phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://td-mg.ru/uploads/files/rakowoxozofizijorajato.pdf In PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/xezobupix.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/tosizitubomema.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cba80a37f7fe022919123205720fab04/91178990243.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210901_161559.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/pejanipewavekakowe.pdfIn PDF document text
    • https://dintek.eu/uploads/file/44805786162.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/39958819898.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/venajum.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/88434356163.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/fiderifafudugosulip.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/51425996154.pdfIn PDF document text
    • http://suurelepa.ee/data/file/53202586387.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/ketisa.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/limopuwilonadagusulaveko.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/lanoninobonoxomuxaw.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144e832a7dd7---merapugu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613860823debd---kifovifukoge.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/19754141683.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/44414846494.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/54110543543.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/dozed.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/kuvuduxetereb.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/64139600894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hacked+rpg+games+for+androidPDF 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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 16428 bytes
SHA-256: b040613541a96ccbcba659c76550c35bbcd6a26c3668c32a96fcbad7361da57d
font_01_sfnt_off00011ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 10900 bytes
SHA-256: bc7c6b58073f2f2653f032109569bfa27b9ff870472920f7a3386a7911b9873e
font_02_sfnt_off000133b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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