Malicious PDF — malware analysis report

Static analysis result for SHA-256 0415609e911434cb…

MALICIOUS

PDF

96.4 KB Created: 2021-08-10 23:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e129cce7e7a52e64aad6109d4828f236 SHA-1: 18ca87779c849df94b9d99ec66992c904d477173 SHA-256: 0415609e911434cb405e3bbabd22157b9c78db03d84fa5ded92e74be21d473dc
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links, which likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • 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 http://np-laser.com/upload_fck/file/2021-7-7/20210707223405325219.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/iinmpd0kjva1di806389ro0bkj/92109284625.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/76937209df188c959c1381efae2e3d5e/vidipugelevuvirajuw.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608240ec61c4f---29992569072.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/65423298869.pdfIn PDF document text
    • https://virker-ikke.dk/files/95923541133.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/xomozudenenesuxekes.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/lararitu.pdfIn PDF document text
    • http://araonline.hu/uploads/file/19191208437.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f41666ab1d---27678273386.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/tipefew.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/f5be56b0f8e282534312694a89023247/17118063969.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59d9ae94a6b2f1605cb486a9f9d588ce/58002767586.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/62714601929.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/345edb0314caa83735358df6f5e81093/fekisogipevaritis.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/0l74envdkjd5i2r41buhkaudi6/82977553469.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/677b0f843fe542c06a110e3c89a4381d/ginelel.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/58763399605.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad5c92e30---lofetejudi.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf0848c05---wosalujasagijafaboxidad.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b45bd2372fa0c50843df65c04a3b5878/wavufazadub.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083b45200ba4---34333533840.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/5841546550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+shawshank+redemption+full+movie+download+in+tamilPDF 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_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 11068 bytes
SHA-256: c2e972ba8f48559cd8397cd4bb8e67017e19fc777ee37d03d7a7ef578624b54b
font_01_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14569 17520 bytes
SHA-256: be102415a740b6af153d51146295e7304db2a5be717ca5e94ada33854f6a2a78

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