Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb46bdaf3ff9724c…

MALICIOUS

PDF

82.2 KB Created: 2021-08-31 17:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c9fcc1e67378ff6986b829fabaa094f SHA-1: 2af28b330297ba70a8acb6add81274e54937e28e SHA-256: eb46bdaf3ff9724c1738edf39ec89173187f896f860221e287b7602288895139
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure, likely for phishing or to download further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=wolf+height+and+weight PDF link annotation
    • http://ptsound.com/plugins/ckfinder/userfiles/files/8721626008.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/18517048770.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4be9e705a8296318e63392fb2305f547/13045221676.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8b7685dd1dff9cc036cd1fb436af5581/zanemoxe.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f2fece544---birijotavurepameliriwuk.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/fulanuribavagasusixunekod.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/78399672630.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610e0f2f36358---bamar.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/mqcrugqkle5vqjffmi82t28307/tobukujubera.pdfIn PDF document text
    • http://93564497.com/userfiles/25412449915.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/laziti.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lc7cq27kvf1oeos3tb55r417l5/wokokawopiwelexune.pdfIn PDF document text
    • http://khochailo.com/upload/ck/files/falumip.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/58845116329.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d3f68b93ebdef13a7cc98d47b8ac935e/kirunizipuvupeporid.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c44b77559---59420107432.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/40094188023.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b503dfe7997---nuzulap.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/2gl907vnu88c3r8a997ogi18jt/doturotusewusinixatizugon.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/13205264620.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/38319711579.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/xapipez.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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 17572 bytes
SHA-256: 4da94d22d0338f907bd9cf6b87d6c04d2dd0967f0e7baff1820facb51c0eb189
font_01_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 10444 bytes
SHA-256: 7ba3ef7c2c432b6137effdad3d24ae3aafd0d309f5147c441d75c52b809e0faa

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