Malicious PDF — malware analysis report

Static analysis result for SHA-256 6650082e67cad231…

MALICIOUS

PDF

71.5 KB Created: 2021-09-09 17:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 362cf56c0e86f6bc0aaf474568f2eed9 SHA-1: ec7c72384461537d7e3a94c9d4ee4e190f63ac2c SHA-256: 6650082e67cad23153ff785663c143774bc9b91e2d57b2fdc10f2b6d860f90f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to direct users to potentially malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=xiaomi+all+smart+watch+price+in+bd PDF link annotation
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302a8675492---57099192335.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/gefalenetozodanodepakatos.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613409ecce58c---fetipolekowixofap.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/5135454583.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/kuvowofumifenadevoke.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/bugevikosopudar.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/67378208889.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/64127851387.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/zidijarokidukawositowamiw.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/mujobolawowagatekolipag.pdfIn PDF document text
    • https://www.confirmedtour.com/files/xusuz.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/66859993508.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/84843717617.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/55691736466.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/ginowitu.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/kaluk.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0258a10c2125a3e1b87b94aa50eb4014/43425265439.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139051a4348f---74944107143.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136f98e51659---3472117792.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/94892300674.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/36288595596.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/wifesaragawizuzibafalesi.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/bitilefizal.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/dapurexakeramag.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/34915754714.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_off0000b59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 16032 bytes
SHA-256: f21df4168c3e012e7532881812989b5c8d2702aa175739adb28fc3d761676732
font_02_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 11012 bytes
SHA-256: c4fff9f47027ef0d5d6440fbe42d53ad92d9d6d58cba133b893a014a13bbfca9

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