Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4bbc8790d5f941…

MALICIOUS

PDF

81.1 KB Created: 2021-08-06 02:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25905f5b2bfefc4b10e5cd8217c97f04 SHA-1: b99d9260f1badb91bac68e717fd2f5e8493fb130 SHA-256: bc4bbc8790d5f941ebf1582ba2ee1ab79dffb15cc0ed18ccc44cc61b9ba2d13c
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting it functions as a link farm to distribute further malicious content. The presence of multiple PDF files hosted on various domains indicates a coordinated effort to host and distribute malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://tckontrola.hr/files/kadejaxukekode.pdf In PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/974120cd849b1695d457e19c3f3056a2/16657457452.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/56082051038.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/19686555629.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/35293669697.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/6711ceed9b1f1e96a486ed697165cfd6/xikogezimedij.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/tamotux.pdfIn PDF document text
    • https://studiorampinelli.com/file/45617352790.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/77893786020.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/geninopixogopetolapev.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d3426ddf6c7f1f8509b51a1962acaea2/23498499987.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/25548134711.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/19625768766.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/072b6a106035fd4fa705e5b9d73532ce/61848542518.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b30ee07c22a656acfbaacbfa9dab307a/dipizuwerodadutosu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9ad65031---23236138420.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/91110373671.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/62unrve6fapov0vthr42ue3arj/95777271392.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/xumuzonibopoxajegasaleb.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/28530564490.pdfIn PDF document text
    • https://tekartltd.com/upload/files/roxotasujixuvapimizabusus.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e516b904---65468851555.pdfIn PDF document text
    • http://partnercable.hu/files/razupopufunofevigubafulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=build+a+bear+birth+certificate+template+blankPDF 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_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 10980 bytes
SHA-256: 5f4781cc53b0ac901a465276a5119aa0339f81105d3be58c5af12b12a9114b32
font_01_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 17904 bytes
SHA-256: dc2f62d140c8e3af50ca7ce27daf0f58782274f6b066d24f991fdf046a38cb53
font_02_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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