Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf4659a26ac9c9a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 07:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bf5e8479bae62298d46147d1cc13b9a SHA-1: 2c59761a0751419f596f7a1a9f958f6b860a5de9 SHA-256: fcf4659a26ac9c9a930a874bbbd1c3ae2c0ad55cacb6083adde81ab092e4f3ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://varbackaforskola.se/ckfinder/userfiles/files/besokokirijidoluwuxekeze.pdf In PDF document text
    • http://murielbellhomes.com/userfiles/files/zimavuvugozejekugi.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/3281930649.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/modfmv4tosqph51d2h7fjjs8k1/mijewilazevov.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/keluzutug.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/66699505518.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/nipituxidovugolupaditusub.pdfIn PDF document text
    • https://ultralloy.net/upload/files/74221767684.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/rozodofetaxevozemuzaj.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/85491422126.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/kupunegas.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/tuxadixiduse.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/xeguxubak.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/65164987940.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/91679153411.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/54e0f15c97640d90870bfe214bca4da5/suxelujoraxutesab.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/52287303807.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/34501701490.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7ce164ff---87690024259.pdfIn PDF document text
    • https://buzyhub.com/files/99933216446.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/kadiwesuvigojipomunuvoden.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613596c8c37fe---44001469122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vidmate+app+iphone+7PDF 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_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 17676 bytes
SHA-256: f903a3091fc2758432b48b85020dad4931bb1ef0ec193b6b30c8ea3b45590492
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 10364 bytes
SHA-256: 7e797279c78aff73a242637860da9164e837e2ee953ffb826874e8d6e6a90698
font_02_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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