Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfc5f375fbd2572…

MALICIOUS

PDF

88.7 KB Created: 2021-09-17 18:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 365e87434f48b730ad0d263ff2f1f355 SHA-1: 96eb68d5e74f4f752c0b7d64a16046da91f7a744 SHA-256: ecfc5f375fbd2572f6782c0ed96fcd9f346a579c9c78ac0512bdfff8a9ac8ff5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains. The presence of numerous embedded URLs, many pointing to potentially compromised CMS uploads, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pixomot.ru/uplcv?utm_term=contraindications+to+massage+questionnaire PDF link annotation
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1351ad8382776201d1c3c8a35450ed95/48730756810.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/98952596085.pdfIn PDF document text
    • https://susta.vn/userfiles/file/49721551231.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/65172355997.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f26fcd512ad390ee44dfc0191ab1d64d/nuzasalek.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/rupax.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/60200240152.pdfIn PDF document text
    • https://olterus.com/contents/files/senopuz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6ab33bab6dc3400f022391201f0d25d7/funuxirigiravenalakajuzow.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/40328819169.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/fejovepidavosujilunoravi.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/jetapibu.pdfIn PDF document text
    • https://infypos.cncmonitors.com/infyposcms/media/74819801765.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/94272152646.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/19142503456.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613519e40bc5b---34071488378.pdfIn PDF document text
    • https://sentralperdana.com/file/34179665450.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614441a557259---tujatup.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/80077288476.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/fafalerujevekikep.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/zuwegizikuxakupezu.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/26321591526.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/18383817545.pdfIn PDF document text
    • 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_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 17588 bytes
SHA-256: 384f0569126b206f4e14064153b854532c3865d54b2b48bfb61fdb9e7a0fe516
font_02_sfnt_off00013aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAF 10944 bytes
SHA-256: 019f32ad4d93d9cd74bc0279bd5fc93db54ab2fd14279b59a4ed498cbf594e81

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