Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7a583a2e658bec…

MALICIOUS

PDF

73.2 KB Created: 2021-08-28 01:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd91fb8cfc207ada2858af733febb1c4 SHA-1: 1dced1dacdf0e3a40ddead79699a0e7105ef21ad SHA-256: 9c7a583a2e658bec0363793c9e3dedadbb4567d064d98f6121dd9c2984ed1fed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://laborke.ru/uplcv?utm_term=how+to+uninstall+dameware PDF link annotation
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f41133d4bf5---58870318464.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/31523852360.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/zodexewuzemojotawujezefob.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd4a9ace1---61727506554.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/n21fq5nf1bt7s6j2hb9rvdau8m/wufuropokanuv.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/83973770175.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202107250512159260.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/24899638797.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a6a200217a6e111a673c8647817b8b22/51831495485.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d215beaac0---10372584883.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c389406a6---wuvewewa.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160fe332eb50de---xorazifewemededisi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b623ae18eb2---luxowawa.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/49904029124.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/57703340162.pdfIn PDF document text
    • https://sarahgpl.com/userfiles/file/ragam.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160978fd9630c1---tizeborafariz.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/wibujijasanewabisawesola.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c2a29b14ae097b5bc6326ecf68d6868c/30862909930.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db0b972dcf0---tonomoxewagisezirijamom.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7e292d7de---pitukulenebufukiluwumarer.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/fidubix.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/53396365446.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/xibipobewagureropisufised.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_off0000be6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6C 15540 bytes
SHA-256: 48653586aac4d960243e802712078b2e4a1cc92c7bea5f15174d42e4768f8846
font_01_sfnt_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 10588 bytes
SHA-256: 01021648506f2c8d348743f7da1b2ff360404798316e1b73d30989e6490746be
font_02_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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