Malicious PDF — malware analysis report

Static analysis result for SHA-256 272c995b905ef6f9…

MALICIOUS

PDF

90.3 KB Created: 2021-08-25 23:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 877afa5c8864126365d6d416e7c6208d SHA-1: d4d165ac5f7a8110de5b13cb3b94a1318fdee175 SHA-256: 272c995b905ef6f926bfc2c211d227243799c5ca70227b1304af5f8b5fb65d11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that uses a link farm technique to host multiple malicious PDFs on compromised websites. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs and the heuristic firings suggest this is a phishing attempt disguised as a financial document to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b759118d6---fomalitemoruzera.pdf In PDF document text
    • https://denizlihorozu.com/resimler/files/73666099144.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ac3212513a2af7a20941255d9b0b7010/zomolilowa.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0af5ab368fbe6eeca8fbdda2419ae796/33357160871.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/89443768477.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/20671969589.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/talaxaduluju.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab9368d5c0---41749131741.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/l8rqcgoqq5o6qajolbp75adl80/rexadowabaruzemilobofiki.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/kinedavibi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe29cc191f4---42494712422.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/20191315619.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/vijajebogerulodulubewi.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3df6b683bed809022172ae93c87fb1fd/99359540842.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/76297837473.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd2945a47d---62583014281.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/a769c6287e5b61712b406f2dd4d0c8db/lizasekem.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/18355659211.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/kekosakuzugapebusurowoj.pdfIn PDF document text
    • https://campermagazine.tv/public/file/46436825604.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/79f5f61b23bb58e55c28afb0e93fd3ea/81897940510.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/22221294693.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/kowopivazezizab.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941eeaaa6d4---mezanagenazoruxagabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=united+bank+of+india+ppf+account+opening+form+download+pdfPDF 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_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 19256 bytes
SHA-256: f8f64ac6da3e6f93bebcafc2d4f3eeb1bddf19eb067b0ab5fe2477a564939d7b
font_02_sfnt_off000140d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D0 11220 bytes
SHA-256: 121ac13f036f9a12cc76c436a9ad5c08b711e69e12fd14a10bb46278c5390be8