Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e10400db785c746…

MALICIOUS

PDF

96.2 KB Created: 2021-09-06 13:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c92ba15210b8db8d64a4ac2a2e56bc5 SHA-1: e64fddb8c8eee046b455b8850eaa3e2591a62b0a SHA-256: 5e10400db785c74606335debf0e05d3287d3a0a01fd132f26e92047a7baecbab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://alakharia.com/public_html/userfiles/file/23010596189.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad18fd2486da1549dede6bfbcf2a2465/50317684860.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/73108457821.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc8d061f1---85328157742.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/tadelosax.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/kipibowivewumawel.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/snk4124vjgeunsq7arkbp69bpi/9532109140.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/boxogomosakipixa.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630313348.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/galananivede.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/32982826813.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/80343973648.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/raragulisogalanonewulemoj.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e06089bc---figedali.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109caa0eebf5---13968874549.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/fh7baf07urlboaio400plud17v/diwupawagowun.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c2e29257---vorofil.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb63ab7ce---94397013650.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/tapitevufugokun.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9ce19534fbdc9829d4d1d2217ce99030/66682587686.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd9aae1b10---3907429640.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/33969028922.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fbe1d85562aab5206bc36643dd052fc9/68161212091.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac560de4e---71561849140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=consumer+protection+act+2002+bare+act+pdfPDF 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_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 17628 bytes
SHA-256: 217fcb9f5cde1b90ab4860a7a32dc1f5d6d50b7124fc33b1a9eecb518a485692
font_01_sfnt_off00014090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A7 11248 bytes
SHA-256: 009cc75c378f6cb88e8e132b9e1d234c4d67b89accaa9d5ad09b5e4d13ef4af7

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