Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57af60fb1155e3b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 20:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9a35496dfc277b9311a4a9e84521457 SHA-1: c9b549a559e88cdb0a90a7f67682443779f4893c SHA-256: c57af60fb1155e3b1a009fb77dc3768edc6e96d08945aaaa14511226ca0ea235
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to lure victims to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://immsac.pe/sgi_userfiles/userfiles/files/72797125482.pdf In PDF document text
    • http://thepnguyentran.vn/media/ftp/file/zuwotugimevo.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/97514633666.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/86461873829.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/26738840549.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/fiwafalababukuvixax.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1gh7v45a6pasj26od1mbha7r55/1808782673.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/80676352309.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad2b2c1b8---xoziwilem.pdfIn PDF document text
    • https://digireg.com/upload/98507599600.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/pd0rl50hlh6p20t2qleed0nndq/jotamabimiximuborafavu.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/pigiporakeg.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/nidubesorabod.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8c5a782ec3285adecf5e6a6832e5bbef/65025770571.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210730_182704.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f83eeb96---6030446635.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/29623105267.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/44810141636.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/od19io1nmvhkt2kv96sr3oa41l/53023923070.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6b23a676---7704236446.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/45106198012.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85bb284371---giserozamuzorimajitaxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=concept+2+model+d+owner%27s+manualPDF 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_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 10952 bytes
SHA-256: 090e25cf0dcf7d4c82c8874c02a643a227ef886cb33b38543832693646d5fd98
font_01_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 17360 bytes
SHA-256: e318093f2998d8628f6df326de5bc19e7be913563405ca8a1522ab8b30d384c4
font_02_sfnt_off000128ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1