Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b27233e2570f8b…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 02:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e805091aa47bc534cb21de3cf7a7992 SHA-1: 3fb10686a16a93ee0039a085212514acde98e69d SHA-256: d5b27233e2570f8bed6e9b9d2cb19a23254d1f495133aead7e299d8732f6ce69
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=the+purge+release+date+2021 PDF link annotation
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/56787345131.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/q98i3fmhurnh8d1lub62nbi228/rituzajazumolifojavujufi.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/tavaweguxelalol.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3435387913d7303320eecc18493a5826/74506574284.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/77901936971.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/13465586357.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/ragudedijifekaza.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/59373955182.pdfIn PDF document text
    • http://labemweller.medianet-shop.de/userfiles/editor_files/file/48510120803.pdfIn PDF document text
    • http://rakuteriyakicanogapark.com/uploads/files/15136704743.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/wavumezuforesam.pdfIn PDF document text
    • http://makaroma.fr/upload/file/88794138921.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091215183873499.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/bozopoku.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/ridebefobawavovoguvobo.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/79kbp72omv2621k6p4i9gffj50/begutilapasaporojutizirum.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/mekiwejolaputemap.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/xalosikon.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/57310741141.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109151920413588.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/63961414779.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/1778504877.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/44282213013.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1351cac73---6274800688.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_off0000af80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF80 10712 bytes
SHA-256: b3041fa9e7d10105355d1d3444f57cfe71f1f4e65771ce28ea082cb09dc5ca41
font_01_sfnt_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 14476 bytes
SHA-256: 46649ef35f81f5d178b2020620dab3ff9981b647a6da516dbe0a5d4ecbf9e46c
font_02_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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