Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c55c15987bcd416…

MALICIOUS

PDF

121.2 KB Created: 2021-08-19 01:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c65d94d3b989d764ae391b5148326a8 SHA-1: 7ef4ca9735af15723234e8ec166f59d4ecce8c6a SHA-256: 5c55c15987bcd416efa3334fcd7cf0a5b9a64b9c5b428fd6457271df3d061b04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure itself appears to be a lure, with the embedded content being unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f2e2018e8---juruwamezefasopomu.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1b0e1b500b9121c9af79a781f284e137/mekifozenilamitavu.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/zafokaduzapibopozuzidad.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/lilibelamizurokaz.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/36dee02b87534681cc21f9ebcaf730c5/vegowezewoxozunamol.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61569472042.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e5aa81eb---74959650972.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6cce4042---figotisumoveri.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/nolig.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/gozapubezuzagalebokevexew.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/79898751668.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d227ef08690f85e602825610b1776a22/76394132361.pdfIn PDF document text
    • https://aashianarealty.com/file/gawolujujuvavigokos.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/jometotor.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b235195d7b2---jizibutawu.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/dawuvaxuxogolijakeno.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/btv0rt1ma2r6betb0s42527ia7/15754482547.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0a9d5957fbe9a49308971fe496be6069/sikapekabob.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ggkqac7ud78vfhg8je4nufngj6/bajufuparajopedafanipule.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1a6b1db6---99640173056.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cabfcef7e.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1f6365a0---83264780397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=breve+resumen+sobre+la+guerra+friaPDF 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_off000175fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FA 18428 bytes
SHA-256: 452feecc0e0f1ddfa6287189570dab7f0020b1ff028a9940d749cb52d4b95afa
font_01_sfnt_off0001a452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A452 10816 bytes
SHA-256: ad39e70990a68c62928c35e5d5c16f8c2723bb689de1f88f4ba8bd8bf97c3462
font_02_sfnt_off0001bd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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