Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54ae56d87ca9802…

MALICIOUS

PDF

121.8 KB Created: 2021-09-01 00:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4ab346293ee896c387ef941abb30cab SHA-1: 66f4d7f89ba12e609631a54a8ddc4ba06af7a7c8 SHA-256: d54ae56d87ca9802f09cabe151491086e3844a69cbc7a469bb20b2548162a259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/uplcv?utm_term=ice+cream+parlour+management+system+project+pdf PDF link annotation
    • http://anquocrealty.com/uploads/image/files/vubijufe.pdfIn PDF document text
    • http://iccarrentals.com/files/file/mejedosoriviviroduper.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/mebasidodoforugawokovizab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d4253e535---16065859802.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/79938120623.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a90fbd3159e---megatozibuwavafusov.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/nizosab.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/votadaturabiruputuz.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8ba73e7cd6687af25b253ef40e5da037/jomude.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161067c3a919b6---67701523402.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/kekoj.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/66571151842.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3740fac2---xewofavedipopuzofi.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bca0b8d5b3b---59452015238.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/44842673398.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610349d56c241---31922099880.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e5824a54ec7fa25d729bf8972ac49164/20600885558.pdfIn PDF document text
    • http://myphamasia.net/upload/files/saxubegapepu.pdfIn PDF document text
    • https://agatanorek.com/files/file/64948008077.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/gidemolujiluxe.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608df297a2c3b---kiloken.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/43244715085.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_off00017179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17179 20052 bytes
SHA-256: bc5ed08d5556fc00d0e495fe3b132cdb7ad0dd39c7660257c45444fcc6b0af96
font_01_sfnt_off0001a637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A637 11168 bytes
SHA-256: 97df5517681df7c908edc5c09c8191d8493cadf32b27d7b316767a6cd176f4e5
font_02_sfnt_off0001c02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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