Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d93a702161849d…

MALICIOUS

PDF

91.3 KB Created: 2021-06-30 00:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8cc72635585b4d27417beb1f81ba382e SHA-1: 8dae542990b6ffb5a52b376c866e14afbb41962d SHA-256: 54d93a702161849d65e1b3f3ac91eaacc55c93f0a7f117eaacde5cf911e45733
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing and trojan activity. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/f1307aff25cbbd5c3c667e4e4ee8d872/fitadexojolizepulagig.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b02afa71d31---vafikekam.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/4lmbig2hm96kf1m8sd7hhfm5l4/18220143301.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc373fd1931---48677007996.pdfIn PDF document text
    • http://absigorta.come/file/65933674178.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/62f887730225992aed6801d492a57ed4/nakodirudezezobusa.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607030339a3c4---vixepafurulesojov.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2bbdb4c4ca3a7ae21de647f465f07d38/xivakaxorazel.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/3b6e9500703ea0799b5bdc35d8dcfb36/mipawokusezoz.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821c0b79268---56563113189.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/rifimusasuneragapigigonet.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sscfrl8oj0kh14mpnfuj7c3tpl/mozazipirosukonorepu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d557a35969---niposeke.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/kituw.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/10052890800.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade28202354---wedejotutupaka.pdfIn PDF document text
    • https://kar360.com/resimler/files/kodipezor.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2e64ab4f74eadfbd348652f731cbe9d2/34292669567.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf89b7ace6---wofavuwinopo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1dc0b31a4---xisezizuvupuwilemi.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/37073409471.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0b232c6b3916245878d2fbc18f41c83e/medibebetadogumapuxekej.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077436b414f5---33976385767.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/35070660306.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5d7c07e6270d7cc0c4e35c98f2ef8546/26339192011.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9502bba0a---2280032690.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d71884cbd---vapizarofagikinib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+end+justifies+the+means+examplesPDF 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_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 10840 bytes
SHA-256: 313f889bf5c660716a0b646e9bb2587b3406d0dc02f2aa25dd602761effbd9ce
font_01_sfnt_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 18012 bytes
SHA-256: bb32e491c278d50ad3f06add0a7dbfaada864774b818f124b81f0aead1e874bc
font_02_sfnt_off00014792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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