Malicious PDF — malware analysis report

Static analysis result for SHA-256 3921aa93adc37061…

MALICIOUS

PDF

100.7 KB Created: 2021-07-08 04:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 766eb2cfb12f01ba9043717a803bd9c7 SHA-1: 206530ec29043d1de82f8adf59efb08277489f14 SHA-256: 3921aa93adc370610c2c81e14ef8ecd5a96db02fd0d242cd30585b8348e675a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=qin+dynasty+time+period PDF link annotation
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f96a45c93f---78935622402.pdfIn PDF document text
    • https://xigmatek.com/upload/files/99219089845.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/puzax.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbdcd1fb57---zupasi.pdfIn PDF document text
    • https://autopratichesas.it/file/85263701209.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f06047ac3---fitikilisadapesow.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/nisedinufetexeduzebiwada.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee62a1a783---74857057720.pdfIn PDF document text
    • https://proxus.nl/file/xugezagixokut.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e071a227ec---96962170686.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7c63e960---sidufogek.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/32887697484.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/dajaxuvokalalajinalol.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/50031787542.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e3110243f7edd970664e12e738b5dddc/61670818431.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b30a9e85d---42239199347.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d19dd96de74---gigoxofufidopezositivugi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085671267dc6---vizir.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/87386043849.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/neremu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732ad849bd6---25094017608.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6b464309be749dcb1103433b3898037a/88498537790.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/91076039866.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b033003f756---galuwiju.pdfIn PDF document text
    • https://asiabiru.com/contents//files/mimiwasif.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/jg45e87404q5j3676pvt8o011p/gejemutolujenimomanobega.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/m3ml9jm4u9c52g6t9mlbp6m9ha/zibezujisefenamupun.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 8472 bytes
SHA-256: 062086d2db49e2ed0e421a1104a3a9bcfa8f11b346639b619ae08664a4e49fe8
font_01_sfnt_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 17348 bytes
SHA-256: cf0a9262495b70a95c266d7f30405be811acbc5615eb76bba20812d8753cece3
font_02_sfnt_off00015295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15295 10680 bytes
SHA-256: fd4cf83b4a9c51ebce8c3fb151ba7013b2d4eba73d31cf7d676d5bd96845e856
font_03_sfnt_off00016b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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