Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb9c3495c7ff3c6…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 08:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d611126ef8d3114acaa173eb6cade1a5 SHA-1: 193bdab536b13c15084c0c6da09d4c220f348634 SHA-256: 6fb9c3495c7ff3c6a4712f0fa5a71547d1d894ae80ad0e134a1417b2795a8bfb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://philabc.ru/uplcv?utm_term=octavia+butler+bloodchild+pdf PDF link annotation
    • http://cwpni.com/userData/ebizro_board/file/10666023415.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2109062308372806410nhk02.pdfIn PDF document text
    • http://synhbio.com/upload/files/kirokafatejevipagabago.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/21021796686.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161416f79684c8---fojugozofatumedufi.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/kobuxatevuzuv.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/73916857603.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/051d52952bc5db87f41d727955156057/jedakepe.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091417450239.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/79189903933.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/70498807671.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/678faa8c56077beef1a7764c276bc685/kelewafajobero.pdfIn PDF document text
    • http://rs-entp.com/upload/file/94689928789.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/96630138062.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96211323979.pdfIn PDF document text
    • http://carbonelite.ru/file/zuravexovopeputupus.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161450989ecf94---venurigogeriloja.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/77774492657.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3ccee8c17b1dfd492a8b15d25a4ec48a/mavap.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109040818495845.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/jesadenujiriju.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109101931173585.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f90c6a82b6---simasunax.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/56668890989.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_off0000c9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FC 10776 bytes
SHA-256: 1ae464ea99f5e821d1f6efd2ebbceeb468c596556765868e2f1063db7cd2c076
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 18208 bytes
SHA-256: 5500daae40fb66fc9cf6e31cc98d109c88e93dda2d8bd432ef9a7087522c8984

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