Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acf0c94c789d2df…

MALICIOUS

PDF

106.4 KB Created: 2021-08-10 10:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f52859308dd0ce4d1c1282c8d500232 SHA-1: 7034857e097efb3fb89c205f7c8689636f1d67f4 SHA-256: 6acf0c94c789d2df357b7b2c75a70363944d507a7a230421643fa3164d0211ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=introduction+to+anthropology+psychology+and+sociology+textbook PDF link annotation
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/c9352ac7734669d20d1dc7fe35ee4f8f/sefidexinalitexaxosewez.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89c723321e---34187637513.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62674a20b1---zolipimesidejemetaretoti.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/k5enc7f636most309r6frq2os5/rokuferubedukunubixisu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/00b57536838eb6986fe641fd5970cacc/27101304803.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ec0b93c00---xuxosuwi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef7f6a8a7f---zovitozurudibakurojuxig.pdfIn PDF document text
    • http://alltechsro.cz/files/92194239332.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/zisemaziviledijuguj.pdfIn PDF document text
    • https://bnovum.hu/downloads/lobudukugorezulakuzamu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/5425341432.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedd374035---koloziforokumuj.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/jopum.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a39efd954f7---71845839164.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b54cbc1f---6310073835.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/80bd636af8043e0ce93eb729f9865d6b/13641024722.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/66187323408.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/gefozaxukolokovan.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/riduwisupivaredoniwa.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/winibakimupabojapeli.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/wukawudanup.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160983d3e450f6---dewedid.pdfIn PDF document text
    • http://chinalabware.ru/d/files/xamisejifofoloxidobufo.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_off00013cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000154be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154BE 16368 bytes
SHA-256: 2e2d4f91b7e1dcaa7c37a1837da991747e239a8da81269bcbcca44b18a16f094
font_02_sfnt_off00017f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F07 11292 bytes
SHA-256: c71ea9de5c6c0b9e62311f0ed08955ada7dd8bb690fb72abd6f89e9e605fd864

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