Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cd6c7d7466f02b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 02:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ade9aff9277e9f01e488322547d102cc SHA-1: 63f03cd312880cfff8a5a592ed665c1fad6febc6 SHA-256: d1cd6c7d7466f02b9d06ca69308d98633a4e1b1368e067a55bd9d6f0aa28a29b
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://work4shop.cz/userfiles/file/visuvubudegi.pdf In PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/1670780008.pdfIn PDF document text
    • http://fabtur.ru/upload/files/92664974623.pdfIn PDF document text
    • http://ladna.pl/user_images/file/tinadefavesevusum.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ohrijtovutnd1ont37mcbdsd53/jemigozexekujoxunajoki.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/94937203956.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a4e001238fc102273cbdbd316452eade/41250035765.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/64206706259.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/fopopiniwijulukukozeboza.pdfIn PDF document text
    • https://tadimtursu.com/image/files/44878919966.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38150792236.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/41348618665.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/49274873686.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7549752aeea2a36c8c70f8331c88ee0c/jexofom.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xelamigisezovodivavura.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161348afe9df4a---nibiwinajasofidola.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/tumubibuj.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/kuposazamokaxi.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/12073868030.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090420035073499.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/pokukarosirugizafazuda.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/24579148107.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/tugodanolurowanebomarek.pdfIn PDF document text
    • http://koala-al.com/d/files/mobizaximarovisi.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/bubolajafuno.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/34752989057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=odibet+app+download+apk+latest+versionPDF 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_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 10796 bytes
SHA-256: 7d5a6421ba8c65b5064dc2f57495144ac0c48631aacc3ac954f285c75da282d3
font_01_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 17976 bytes
SHA-256: 854e6f303bc2000a65029af60ecc1a26b6cc1ebaba35e07b3ee50200cca0001e