Malicious PDF — malware analysis report

Static analysis result for SHA-256 b777534f2198bd97…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 08:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cfdbb707095071e52e23add88cb5ad99 SHA-1: 3c1e29ba8365463297bafa224cc2d59c8bce7fb2 SHA-256: b777534f2198bd9759f6df6285371341d07111d0d641ba98e7fd1dc826c77ad9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160706b1d9759f---16849449451.pdf PDF link annotation
    • http://ahsaipu.com/v15/Upload/file/202152525567722.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609781a122f15---gawojete.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/jukulugobarem.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wosamaxasesutavujogono.pdfIn PDF document text
    • http://labradory.pl/file/jefagiletadaze.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1818b77b8e---lajusu.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/biwadataz.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-27/images/files/87168276467.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da24b5d5fce---mebosiwuxilosumabelig.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/62911413676.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/fugevemaripatitu.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/89476354117.pdfIn PDF document text
    • http://tochuchoinghi.org/files/96640564349.pdfIn PDF document text
    • http://www.toptehnik.si/images/zakuzetubegumimaguvoxeno.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/vovude.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/talosumujuvabarobofo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/povomib.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084984aea7a4---mipevefupakofup.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12321eab3---85724802655.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/defoxezilumukubipev.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/48992316898.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c09e75a2db---rujawidovur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=rough+guide+vietnam+pdfPDF 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_off0000d3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FD 17464 bytes
SHA-256: 9edf4152d76677e0f147c7f78810e8a0f5dc9dd592bbd7949545a20f384154ca
font_01_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 10840 bytes
SHA-256: ee2f06857342f5efa8bdebd39e252bb0eb1b2599481af53fec99368c47b2826f
font_02_sfnt_off000119c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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