Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f6668af5cfb4c3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 22:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d725ccf57c986b516308fc23db5dfdb SHA-1: d1a302ae430d1a224626ba2b1dd2108a7f7ef4e6 SHA-256: 82f6668af5cfb4c31c94f30e2a0e49a9a590fafbfc845b6e86b09cbdb701bf96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=uplifting+words+that+start+with+o PDF link annotation
    • http://camelliafb.com/uploads/files/202109082147239381.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210908_095817.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/99592540367.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614889dbef8eb---dopefedirovewej.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e878b9050e3be5031d23b54374d5fe7f/37929728139.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/89042608578.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/d06adacd3bf7b46cd76d35639a9f3c05/zimowufolurawel.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fb5d06592---vegefowarozajesakizivon.pdfIn PDF document text
    • https://nyig.com/files/file/dexajabaw.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/garesarakoxesa.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/12235088027.pdfIn PDF document text
    • http://soles2walk.com/data/file/7315199928.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/dofabirimivuru.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/39532201686.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/zazotabamukonaxesage.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/86708995090.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/gadetogote.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/fipugadupususa.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/vikasogovejun.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/bujen.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/xawanevekevilumejizijota.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/86860453876.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/46415596976.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/80354559061.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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 10736 bytes
SHA-256: 6d00ebfdbee976cb86a7fc278e3ee10060ecc2ec0fc788012e532eb8c57eee2b
font_01_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 17464 bytes
SHA-256: 1c40de9c50ba8af67e853fd8c6e6bfaf01a37fbf9364bc9fe263770c0a31f8a5
font_02_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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