Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff85d5270ff227d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 03:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cb82146e3247b775e05d1439ce043f32 SHA-1: 4dc1fd525825b07af952f1dfdb4950d513276cd5 SHA-256: 9ff85d5270ff227dc43f30369ac45798c8fe4786df4adaa1b8b19ad207190017
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier with a high confidence score. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.videocopilot.net/assets/public/ckfinder/userfiles/files/vonuduxanazibekeb.pdf In PDF document text
    • http://veszpremkosar.hu/_user/file/nomorapiguxiki.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132afe0da154---bewadimelasokatom.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/samebemisosepekukinigepi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133888f1fed0---61502502859.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37945031d---wivinogiwijemokaled.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134819bce96d---10202427763.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/rerekowepunexe.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/bixawevidinovu.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/90838338399.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/fofetisipetune.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/78067630657.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/vedasij.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/dufevajewidewelufuxigixus.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/40309147655.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/76965679516.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/befuvevedemixez.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/47031472834.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/593f2a3427529aee795e24f04d878ae6/sobafumuxabifanazura.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136f54d40f97---goret.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/suwow.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/48597384975.pdfIn PDF document text
    • http://glassick.com/userfiles/file/76562990134.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/77066810461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sonos+apps+for+androidPDF 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_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10292 bytes
SHA-256: 19308426c9de2738e8e38486a05d8d35f254a53a12946cfa86f319fe8f9f2aa5
font_02_sfnt_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 18244 bytes
SHA-256: 280379624e00736fbb5df1951867dc3a4ea9648ff04ec8128de97da8c376428b

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