Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb2a7163fac1acb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 02:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a37f6cbe5a54994764c57292975ad88 SHA-1: 1abd25b2815b70a188d6fbb6b6d1e076a35efc08 SHA-256: dfb2a7163fac1acb818104b3c033af3bfbed168e2a5433a10e9f1316257eb25e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised websites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a malicious payload. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://actsonics.com/uploads//files/202108021945056222.pdf In PDF document text
    • https://mimpiindah88.com/contents//files/telalamuzabex.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/jedesugo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc8565c0f---gelogufobesiwarivog.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/18347804814.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jopadako.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fffaa9701cf---15365707394.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/dovobobebuf.pdfIn PDF document text
    • http://poiskvod.ru/images/file/61241604569.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/diditaxit.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/lomiguluwixu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e1968d5e4---saweliwafivudi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160acf60ad5b1f---dosatolozo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3b5cb3c832dfd560cc5cf9a27f0e73ea/vubemesobapefulategibup.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbd6f35d3---98538854050.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/kaduvusu.pdfIn PDF document text
    • http://axwelindia.com/uploads/63437553963.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/u56s4m3s3v25g3mhkp7oprat32/sewiruvijepazaporomelela.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/59731278300.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/64405786088.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/92385312606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=exclusion+renal+definicion+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_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 10700 bytes
SHA-256: 9e44597a3d55ddb85bf593facb16c7bd6df3ab6aac7679102852e712d30393f2
font_01_sfnt_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 18092 bytes
SHA-256: 25339f963dff76be28b3cd8851da025534dfca19de96212ed4f40893f1a04f68

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