Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3cacf658cdf0ec…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 02:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fb0a91378d306408ef6bf6e1736fa15a SHA-1: 02e4a11434a1f068ed75afa1965edec1f2f0cfb3 SHA-256: ce3cacf658cdf0ecb2b9ee9129ac60c76fc083e07ba1c9630b4ca98a8ff3e20e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jjw-led.com/userfiles/file/79110320491.pdf In PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/pexerukuraridedenagavomaz.pdfIn PDF document text
    • http://techbis.pl/files/file/nagerifinukirizimugeguzi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160851ec734ea8---15906438507.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/repizozatapexawemofu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e4b881d6c---102998624.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/64240071638.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607909125a0fc---pezijevipajejo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/a70id74prnml5k0293h8hbdrs7/98558364106.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a39b1ff2---41941475412.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/878p1627fnukmo6r1ma63heiiq/bomolosodizabaresupam.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/safetoxuvaga.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/moguxibironunasu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079445e87e4f---84653914103.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/volug.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jgmjaiudvp2pqo58vf6b3anf5n/dudezosuwepuzedawisez.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609925b1dc4f7---xafakirubinol.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd1e9008e---kizeforavawidovaxune.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/jujedujinag.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021617184713507.pdfIn PDF document text
    • http://xn--22c6buakeib3ax0bzcc5b8tlc.com/userfiles/file/mafike.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/5088035599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=history+of+dharmasastra+vol+3+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 19248 bytes
SHA-256: e1c70bdace4679b787fe04c646aefa66edafaae65124cd27f61b41a1c4d7c952
font_01_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 10872 bytes
SHA-256: 161075eaeb2c679859b68c3514c398155d28bca02b39e8d378d3dd06b5fd2ad8
font_02_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_03_sfnt_off00013a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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