Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb43d0c4fa1a3616…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 23:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5aa47e764ca6a6f0cc75b1e18d442a1 SHA-1: 1161fb5a22188de545b0629cf1c2521596d551cc SHA-256: cb43d0c4fa1a3616fa5dc1091f7b1adbc65e1be81c0ea60fae36f917e762c8b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URIs, including links to compromised CMS uploads and disposable hosting, strongly suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/didof.pdf In PDF document text
    • http://beachfirebrands.com/userfiles/file/juwabasanabogas.pdfIn PDF document text
    • http://leguido.net/files/nupomodela.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb864fcd1---dexure.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d57c6b87---75602558810.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/nisenusukex.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/32667190897.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/69701669508.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/62793033758.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcb58d02e6---kejogexuxuxap.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/45886074774.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f1082aef5e2d9a083b19099a2ffc332/45571409424.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/gadobi.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/88467074595.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074313d427b4---dapekukenilepejot.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/db9455e6b52e14112785efff5843a328/rijisafugujimodosefine.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7e622087---52312983308.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/zusapujejagatogutikolu.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160705c7d3a17a---18936463686.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/97202025819.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/79385502944.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/c84g0ufa97620qs7hefrf47sr5/delazifudenebojogevo.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/95073157579.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/9f487104cb42c9f4b671d5ffaff2060c/89789384606.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607678d44f16c---61735864297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=online+pdf+to+jpg+converter+below+20+kbPDF 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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 11248 bytes
SHA-256: 53c6b5336b9a10fcb63840648ce709241468bd753af4f70ead88a0806da4eae7
font_01_sfnt_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 16776 bytes
SHA-256: ea9975e79d99d0d83c9efee3fc496e3fb7534ab7785a63f168afaeaaf14beebd

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