Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8521d76f95586a0…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 06:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 338db496d6217a7c3fc6e6f40a16fdf6 SHA-1: 3d80521354eff8e8471e1ba92650215ac8da6d39 SHA-256: c8521d76f95586a0c345585a0be45c549865d6947539193270bfa44c2ec27f5c
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links to compromised websites and a deceptive 'download' button lure. The presence of these elements suggests the document is designed to trick users into downloading malicious content, likely leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9f5ea4c41---14319189586.pdf In PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/xujaxerisib.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/fubunikafoba.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/bupoliluregirudaluven.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/8294936363.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/14301009244.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/nevilixesosoninuravojax.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/vapoxu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/fjrhv3m4ahith0l3bqb9cothdr/41912739526.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/safulema.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/kakid.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/jirumirib.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/gepin.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9op59c5d5k3l3uj1gpgsel0vjf/gulof.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/gexepiv.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/eb61307f5766cbb3bfcc4bbe98f7e2bb/wakufupanivu.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/zodowigo.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/bobinejevakexexotipek.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/f9826814be1ef3817b62ecb797d7eac1/6829363986.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/tiwipujafelox.pdfIn PDF document text
    • https://phr4u.com/files/jariz.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfe06c306f---migoxedewonagadil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fsrh+ukmec+pdfPDF 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_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 10432 bytes
SHA-256: 7d03ae3cbacf2c7dc9ad770504268d89efaa9a12cca8a0b80317e5022c782249
font_02_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 19224 bytes
SHA-256: cf8f1308e9fe6f12f0db8e1785a66ad441964cbbfafe914453a0d3414b0c6723

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