Malicious PDF — malware analysis report

Static analysis result for SHA-256 930b50bdcdd1384f…

MALICIOUS

PDF

93.1 KB Created: 2021-07-06 16:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 89130d1f19812858de7f62c0892440f3 SHA-1: 3685ca7dacbfbb45f2e9875df5cae665d913ab4e SHA-256: 930b50bdcdd1384fe2aae15e72751aaece4b50c537df8217417149dea644ba9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malware. The presence of a 'download' lure further supports the phishing or malware distribution objective. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/fb45afd9d80a01e646d392e888ac8fa9/7564627911.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ecb11d62---xizumixigas.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210621083841196773.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/17287947703.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/69463630126.pdfIn PDF document text
    • https://dineflon.com//files/gejediregaxujesazol.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0vjkobqis0n8pehdrs8ekjcqr4/kasetitisiwuwulurasenabef.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609985c6ba416---gijug.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/47451698953.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/97017532175.pdfIn PDF document text
    • http://uci.ir/userfiles/file/jawewarapi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/2054h14i0ll7uo06dhsgkiejh6/fiwotesubesijag.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/gjvjjusab7favfdr88bt8guus5/rodadomagoxuk.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/pesuxu.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210703112539.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/38d0777bdadc5b6132a8aaeebc3ea69e/75233438946.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/panomu.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/65351495791.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0692f02acb---60437459003.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/26816793159.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969af0729b3---33346381603.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f4a8612126857be2c3e919bf8ea709e6/balam.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ddd22bcf---19670983331.pdfIn PDF document text
    • https://mobilityservices.it/file/zalonitikalemulagalawi.pdfIn PDF document text
    • http://artospace.com/pics/file/36819936980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ms+excel+shortcuts+and+formulas+pdf+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 11076 bytes
SHA-256: 6ae9a15bb8deef3bfdf2aa881a7ec83abfa0ac69354ca7d8e1743f4bf45bfaaa
font_01_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 19136 bytes
SHA-256: 400b3feea904fcf2428ec14f511254ce00afe313d10f18e0782ff8dc96537635
font_02_sfnt_off00014ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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