Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc755fc206126f1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 15:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 50c5a7dc59157299190bcd48aee0408d SHA-1: 6d690eedc9bd644c53eebb930eaf8edfd7cfeedf SHA-256: cfc755fc206126f12e6a8ef42272c8e66602ee2419677bf06bc77a3c1dafbe46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

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 https://queure.ru/uplcv?utm_term=my+hero+academia+season+5+episode+9+release+date PDF link annotation
    • https://nguoixunghekiev.vn/userfiles/file/88578701563.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/bupexinigokosesigom.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/81218147311.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/roxibime.pdfIn PDF document text
    • http://linza-market.ru/upload/files/bedivonu.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/xukamolixivowexem.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b63ad7939e9b674724e131b2aac7dd98/19322344358.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/58256645310.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/28560903006.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/ruzukiwu.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/51394699523.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kelaguteg.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/sugagigowoneviforulimike.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/21502346142.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613caad50bb76---daranonuwavozajodij.pdfIn PDF document text
    • http://benetalent.com/upload/files/bowenunadekinosanedunoni.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210911154916-kakibifezo.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/boteloxaxewagixotumipu.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ae8f5b70196d194ff38d456c0f320a05/73839490257.pdfIn PDF document text
    • http://micruts.org/userfiles/file/nelovikugofaki.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf6c04077---xigolizaxi.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/9801900846.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135fd89c4934---loregurenotunebiviburuvef.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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 11188 bytes
SHA-256: eb664e23cb9053c6a242c7bdc8dbe1dccd61486cd0a4b3a855882a295748ddb2
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 18540 bytes
SHA-256: f99ea70b3c045e43f858bfc7fb8ff923d44f1f317b2300dca31f3b724f61fc23