Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4a19fb4b15c7e5…

MALICIOUS

PDF

99.5 KB Created: 2021-09-03 18:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1852fad009cab59da40a01edc8eb82a SHA-1: 1c577ac10e94cec46b3b36d2bd215f28325edc3d SHA-256: 1f4a19fb4b15c7e5b70ff14d0c7184a5660f4b7a6b8f0e6097825a792134d5cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, indicating an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076261082bf3---wabozirog.pdf In PDF document text
    • http://webinside.pl/userfiles/file/8298835575.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608245a31d0ac---sazokefuwabulajigudarup.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6626671e85---81106085096.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/tugiwimidagelonazog.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c4d4a0cb296dbd0f49f51cbc2e590748/334864370.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b3517b3cb76d93ff8bd387cea49c1e5b/zulojozefabo.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/merusowividevaseguka.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tuptm68t0c2cgem18s5pkbk5v1/xakulabisawuzefajula.pdfIn PDF document text
    • http://getem.eu/files/file/jukituxokazazugajujiveli.pdfIn PDF document text
    • http://greenbrier101.com/userimages/80526818817.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941722d73e6---jexup.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160874aecd5c4e---62810820362.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/rokidemeniloxuki.pdfIn PDF document text
    • http://korytnica.net/data/files/63191478017.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c813db22b---junenanit.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bccec7b7612---sibibupenoxot.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/42010325470.pdfIn PDF document text
    • http://bulmarconsult.com/files/koguwusoza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0be962d32a---58716111315.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/wexisipedifake.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/96462a634182f2948cf29b9ae4aaf78c/fitijoj.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16306562795774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=home+cooking+hema+subramanian+book+pdf+free+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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 11380 bytes
SHA-256: 1d0052cfc3d91a324c85752fae1a2729994b18dd8aa1ce68d3e6df6acd831cad
font_01_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 20688 bytes
SHA-256: b81f7c4780385506b2b31f05e893c9a6bd7c1d09cebf7059245b80e7b6ab1060
font_02_sfnt_off000150bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BF 16344 bytes
SHA-256: c2c240045737c9a971e4d3b503cde8968c383a967b3d480f953e04f0382b4471
font_03_sfnt_off00016736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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