Malicious PDF — malware analysis report

Static analysis result for SHA-256 546de6308e2fec00…

MALICIOUS

PDF

89.3 KB Created: 2021-07-01 22:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 329e071b83a1224e10b66343157ca118 SHA-1: 79a3835e3389417b6b35ded57734d46940b90a89 SHA-256: 546de6308e2fec00b8e68c1331b29f3a588432370b23572b777a50673a664c30
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 with high confidence. It contains numerous links pointing to websites that appear to be compromised, specifically utilizing WordPress upload directories and disposable hosting. These links likely serve as a lure to redirect users to malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://wills.sg/wp-content/plugins/super-forms/uploads/php/files/9e61629f1ba9e0a68dc17d6345f08ebb/59903901813.pdf In PDF document text
    • https://alnahamgroup.com/userfiles/file/gosuzejugumeze.pdfIn PDF document text
    • https://ubranni.com/uploader/files/zekegafetedijo.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/sebuxepemabivo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c5647685---pebibesewanugapidugut.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/2361799290.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/334bpl9kcf2a4pt481km2t1n8b/dinumofa.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82758b8f8---teladakowibilutoliv.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16085a062b3e5a---biribisira.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/dumosifuzufuromom.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/kumamebetosam.pdfIn PDF document text
    • https://patc.fr/imagesfile/kinene.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ndqu3nsn4p0ogulahdkd2d5kqp/figefasesogekukixawubad.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790ff0bdc02---48708621402.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mc361lb343c39gmnevjgiu45v6/zuribitozomexaju.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lakuniwodol.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a22cdea4c34---16803671687.pdfIn PDF document text
    • http://canvangdientu.com/images/file/xizon.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/7000747965.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/837336d277685a4eb8815117e24d17a3/jefalonelonu.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4e4ebc932ceea7c3f25b192c072437b7/81910569052.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/72693859190.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/33241260108.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/73098ea21a7cbad6530dce64553fb8b9/nisadorikadesuwigagaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=typical+pressure+drop+across+control+valvePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_01_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 17980 bytes
SHA-256: 45cf3af5e454b1504bd0e8b5dd6a959a38737d930668cb996dd4e69f1bb6774d
font_02_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 10752 bytes
SHA-256: bb3cbb98a5aceb4072a2693234fa19794848936c9f260564a68d13f9be271372
font_03_sfnt_off00013cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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