Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc21e149d10f1129…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 20:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8824e018314c95183910efe6dbc3ff5 SHA-1: 445b726cc2ee57b6a7ac7be51557a4feb2b467df SHA-256: fc21e149d10f11291443d2c57acee5d73936f0cec5c033370bd56205d88caf04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.beverburcht.nl/upload/files/dozoborote.pdf In PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631476228.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210912062509_vvap90.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/22576707743.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9dbfc45c24cc1f422525abc008beccdc/36546185253.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/5837887063.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/dujegosamozu.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/69559970583.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/78252505760.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/numuvubisogofogosuma.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/filawumivetum.pdfIn PDF document text
    • https://iwistw.com/upload/files/midukuxiwin.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/32375815008.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/kukurupimuvo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134437a4eb80---78464894467.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/7799182145.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/bijudebibazarigepidevoz.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///36507368399.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ca9a1ba6---zumod.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/parijoxobugovakuvonigone.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/fisanuwojonit.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139a553d53---29673755414.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/rorov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+apps+emulator+for+windows+10PDF 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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 11000 bytes
SHA-256: 8f4e33040b83de65f09822c2e5ba570dfd3010222ea2564171bc5128263138f2
font_02_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 17632 bytes
SHA-256: 3d901eca222ee1fa8966ab3ef92a3569659e0f94f5f36b41c7dab3324e0e0d1a