Malicious PDF — malware analysis report

Static analysis result for SHA-256 225d82777d0f69a1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 14:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7d593076c9c1df6921fc6f1af4613e1 SHA-1: d2c21be02a2d178acd853966c2230f4202594304 SHA-256: 225d82777d0f69a179d4ca3fe9a4731e1ba17f250fa7805a2e5ce1f7c80ec936
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=android+phone+missing+text+messages PDF link annotation
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613da3d3dc0a6---8658133786.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6h3i9lnvqtc2684hsbcsiirltu/94059882006.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/suxugurefibomebibevutofi.pdfIn PDF document text
    • http://nanopena.cz/upload/file/90023198464.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b1lbme32p5upqtbuvrsk27eqa6/28540393166.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/64283019104.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/8247593016.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/45017784537.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/29573122993.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/satajikuvufazejero.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/6912903204.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/62641455812.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/fakedesimu.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/zadamavomigebavexutejupi.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/gazejujewoxepopipix.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/54431035711.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/kewovipegawotofupo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134e23aae47c---902673037.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/56103503326.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae57b7a62---tekidukakoloxikidafonozun.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/vojemipokosafu.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/relazopiwakujanite.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_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 17944 bytes
SHA-256: 937d49891bd279aaf1187ffff9c215a26cafd15cc19ef6a13463e23f4a8e3641
font_01_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 10876 bytes
SHA-256: 1f2f76d02b967f734a146214936f0a245793120e41866e2163942461734cdc8c