Malicious PDF — malware analysis report

Static analysis result for SHA-256 da21224d26c5020c…

MALICIOUS

PDF

90.6 KB Created: 2021-10-10 08:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0cd55ea8d997235196f9e2eea0d21e4f SHA-1: 59288313e69e820c98bc88602c2627ca5a74226a SHA-256: da21224d26c5020cfa14ed9b33d1edea69f2af7e0411b5d18d9bb152ee9e25e3
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/48568687136.pdf In PDF document text
    • http://pandoraecza.com/genelresimler/file/660489714.pdfIn PDF document text
    • http://benetalent.com/upload/files/zopafinadavupogazelo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/cb7d4702632fd687748034c8f26277a7/51700920421.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210922043738.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/woxasesuwir.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/wedarisuz.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/xoronozofosatonujuto.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/xatimamor.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615572300238a---96529128755.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614af2ee5c93b---xawat.pdfIn PDF document text
    • https://satesayap.com/contents/files/21105807158.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/99654475534.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/belaxuxewula.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/25848881946.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/jorepupamilukukopamakos.pdfIn PDF document text
    • https://termofriz.rs/files/wuzifowovujeru.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/lomaz.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3e8eb9e3a---vaxepiruxixunefipu.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/kazonutusoziwinikog.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/70585888409.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/bdcea58653f4069729e91907a86aed43/tutiwited.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/79416926541.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef94cbf6a0---gojifagataziv.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/45619335873.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/37044679385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+breed+villagers+in+minecraft+1.15PDF 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_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 19216 bytes
SHA-256: b94b9b50b3033a598bd5b5cff9e297b425ed19a26e9f4ec4a2e26a3052ee9dac
font_01_sfnt_off00012a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A27 11352 bytes
SHA-256: 847fb88488dac68673e7475a1af403d9ee1d8a54beb3b97b3b132d29c2e5df68
font_02_sfnt_off000144ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1