Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e5f32119dc9b52…

MALICIOUS

PDF

130.2 KB Created: 2021-07-15 11:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9369e2cb0aa04beeeaf3a1ccd41f898 SHA-1: 6899efdaf8a07e695f80f0959b5e9b6b2ee72854 SHA-256: d4e5f32119dc9b526361b62d348b2d9198a75f403bf1ef40a37885c03a4fe794
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users into potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

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://catamma.ru/uplcv?utm_term=just+2+words+answers+level+635 PDF link annotation
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/69fd30e468a4d797699163d149d6a8f4/9704949264.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e3af18e92---renokamolabe.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vatusonezufawosopofexa.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/92393662581.pdfIn PDF document text
    • http://secretinvitation.net/images/files/wubipono.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7apooc4n2tdpscht85ucqj6kr8/sodiliwazazapelomafunaxob.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/wikogujane.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d2d70cc9e4ff7855727502c2631bdce6/20391640452.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/08226af5bcde5ea009c58e1afab7c014/98509774771.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210706054524679626ns52i0w6578h.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/kipasez.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd336585b7a---kemilo.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6939178b4b---kumubepoxikoroxuzegabe.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/22067926112.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7863aaabee9dfaaf5369af3bdc967d8a/xobenevix.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffea7ab770---61664789249.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/70692266443.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/36291888953.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad0996f3e---lojeleliguguwetowunofolu.pdfIn PDF document text
    • http://108homed.com/userfiles/files/jefupagadofegipuduju.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/87516790665.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/66806030576.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/ximazadarovirepeniruseg.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/rijafa.pdfIn PDF document text
    • http://leton.pl/userfiles/file/zudinalejidamoj.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/gurelof.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_off00019b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B367 17476 bytes
SHA-256: e081725522e759a024bb4744bc5037595f4d56dafc628e5109c276b8b534b104
font_02_sfnt_off0001df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF9A 10984 bytes
SHA-256: 678486180cdfad187f1e6d97c884c2986e745164c76de5670ef000b70c93ead9

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