Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b251985e706675…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 19:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d8b31c15af1b6145cbeaa9bc26308a8 SHA-1: df0c73d3455b61385bea9b0c5f816e17916557e3 SHA-256: d2b251985e706675b75680a509ef2dfb28c68941e3d2d09cf8445f4dab1b7b26
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=650+commuter+bus+schedule+pdf PDF link annotation
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6ed13360bd4fb75dfbb453eafa3ba708/99890799166.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021080715530386.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/73794990148.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/sezepekixadofiviwajuwofol.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f28078a7534f61640ec54343fc0b7e8f/domulavorasitubowoz.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-26/images/files/32531133121.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/dozuluxurutimutadilesen.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/bh7htdufbq11u047ncrr8hrd61/23138675239.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161032bd46fbff---51722694662.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/pefoxasajesajodukibuwem.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16093bab8e0d94---20194768767.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/lexupobowovezipafu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e330201b8---wurin.pdfIn PDF document text
    • http://sns.hu/_user/file/doripasaretapebokekejaki.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/nerilu.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/nodilivep.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a6ef040ad---80032749028.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c892761b0fe---zurezem.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eca0169c3---wixupe.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/97231226c0a2b9cbac046fea3c5709d3/98854931038.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/pegifadita.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/zaxafamevekagazedib.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c076b74ef32---74286168805.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608af68631208---38311928511.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_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 17248 bytes
SHA-256: f3d0c84518bc774d36aba496523ad617dfb57bf771ea9317c6a3a7f70edc1320
font_01_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 11092 bytes
SHA-256: 8ac6f979d621d68e6910f8199ed7cb9a0815d5a496c6cd472a8b010ed9d0750e
font_02_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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