Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d24e9e4d152f65…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 16:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be0efff049208f5a5f23452c1095f4f8 SHA-1: 36ad319159c7848324bba0b935715ed2e2edf0f2 SHA-256: d4d24e9e4d152f65a5a01d07d0d77abca36e9d5dc45da38b89e69d1e031f92c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'utm_term=download' in one URL further indicates a lure to download content. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=download+asphalt+9+legends+highly+compressed PDF link annotation
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/86400156265.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/39964978908.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/tadanasukupov.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/60071317077.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/1db4efb0a766be8328b7a8d4f95db3cb/6475051146.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614969e8e0f91---kawofijelekarevi.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/79703638001.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631209653.pdfIn PDF document text
    • http://montesantangelo.it/files/files/xosexifepufijadu.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/61633639023.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/84451793164.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/zawogore.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/rodita.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/pokivuxar.pdfIn PDF document text
    • http://mousike.it/img_ins/files/16262481381.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/nomebavelasapinixagu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139d36e9caa2---sudozuposimeno.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/durameso.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/dotosa.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/333c0d9b9a5fee705d6d3431cd00b9ac/58187342352.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/mezipagulonuvel.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/79311044261.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/wawuwugezogibewojami.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/32033705881.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_off0000d11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11B 19504 bytes
SHA-256: d21b1e267134ea6512965e2ea319221ced1859cd66c3338025a8ac0b6b621c8e
font_01_sfnt_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 11328 bytes
SHA-256: c84ced6c9cb5ef1ecea935333d16991c23c156015e7b392c1b7e8b332f2b2c29