Malicious PDF — malware analysis report

Static analysis result for SHA-256 53822e91d283dc06…

MALICIOUS

PDF

70.4 KB Created: 2021-09-04 18:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48e29a56a5c8ac33df2d9636bdf8185e SHA-1: a59d0acc73f6fb319cc1ffd337d5cbefb72b0d50 SHA-256: 53822e91d283dc0635c7717f5193a7708aa74e909b569c47070d473b9117214c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=alteraciones+geneticas+humanas+pdf PDF link annotation
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/qm3foa70dkfgmgvb1t66htspi3/xumofato.pdfIn PDF document text
    • http://byecook.com/ckupload/files/86873972532.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210716220805162.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3db1bed8043c966ed428908ef191fc66/17848637801.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3851b9c93---37543172639.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/farejonatedolenituto.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/nedami.pdfIn PDF document text
    • http://rubensova16.cz/files/file/79887505515.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/wozewovupavok.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/33181216518.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/34484213829.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68b2a2120f---93446876154.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/5e01ab018d2ba2b10b7e7ec4931a9938/gitojuv.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/faxugeruwuzopojudaxu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ee02b3367---81150104142.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/74930889204.pdfIn PDF document text
    • https://ancoraeducacion.com/images/13617279179.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/78502011869.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/gopodow.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac09e89c9ab---53092027392.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bbe735f18d---zumajuno.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/fogirunivosora.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/9419068880.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/poletinonariniva.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_off0000b1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CC 16388 bytes
SHA-256: 36d2f20ea0f59c16d6f25985fada3b638cb68e8b18801a17a6b3dd66a775a28d
font_01_sfnt_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 11148 bytes
SHA-256: f90fee12e1ea3fd90a00f60a5ffc377bc20634a7b8611f8f09af829b12fa09a7

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