Malicious PDF — malware analysis report

Static analysis result for SHA-256 af008dc3f2fb307e…

MALICIOUS

PDF

85.1 KB Created: 2021-08-27 18:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c817b15550c647909a83c4af563336c SHA-1: ecdc70f0bce34471e0d5426ca95392f4eb3d12bd SHA-256: af008dc3f2fb307e376d8fd34a3b7ff69a3c456cdce059b08c8086200a6ea38a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV and an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The presence of external URIs and link farm heuristics indicates a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=few+lines+on+honesty+is+the+best+policy PDF link annotation
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0fcb70eb---vojabokisajupun.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1eb3a9ffc---21968919422.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/5389649806.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/aa52ade70b41be467c9653309485ffb4/92564111407.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/28983377000.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762e37aa82b---48326373091.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b072859a6---patogobedamenerexu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1838aa4601cf99b00026500c6a9dc033/fizowof.pdfIn PDF document text
    • http://mextro.de/upload/files/gevefopotulezagakatuxu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2582c5cca9358e5562778666bba05467/54242850574.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077089a31397---zedadowobepumulopa.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/56275365966.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e1c60131---dedum.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/897744250.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/6398779761.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/paponenuwabuwizadedi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe40c08312---95686099198.pdfIn PDF document text
    • https://themalc.org/files/file/98252333649.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/27162286645.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d1bafd8d---63380354027.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fekokole.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160835c554b176---78555823288.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/noturotasizijepotibemadal.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_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 10528 bytes
SHA-256: 6ce010babb2e1939da75ddedb4e0a421c2a6246760eeb88f1c027ca671cd8141
font_02_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 18156 bytes
SHA-256: 81821fd5c73987eade5189351620aa6eab9f83d8b3d3cf738825abfc1128f54f

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