Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf9f2ce0b555d15…

MALICIOUS

PDF

81.4 KB Created: 2021-08-18 21:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09eecd6aae593a42de19fa0b5d7f7cdc SHA-1: 37e7b31af4c45797e0447df9b284361d2148337c SHA-256: 6cf9f2ce0b555d15bfe5f976abfe85c7ae74753636e24b083d834242bc6d9eb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the link farm structure suggest the document's primary purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pixomot.ru/uplcv?utm_term=funny+merry+christmas+meme+gif PDF link annotation
    • http://cw-cut.com/uploads/file/japugululereboxunadejabug.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/xolanuvugegebit.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/79307525727.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/ruwufimujuwene.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/itssocbufhohdafqpbaangsl26/jisirix.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/96341466308.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/4420c7f658b65eacaa2c6664d7e5a501/mupedo.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/90814727412.pdfIn PDF document text
    • http://msiutilities.biz/documents/wirorojavepuji.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/bezezizawakexuxujivozijuw.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/33286222800.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/vagatowudikubibusovav.pdfIn PDF document text
    • http://stattus.com/assets/file/21164866942.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f50364117b6---62123504834.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007389dd8e5---bitifojaxavowuzuwatabilod.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ff992661d69cdbf9421f321923a79ba0/95014187853.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/61526935145.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a3c25eb6f328f3185afca27c0b6260c2/mikojadofimizi.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/9af5434a25466ae60fd4887eda0107d4/mibeta.pdfIn PDF document text
    • http://russia-ex.com/zolonedesetoliwonusukij.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/janekiko.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f866c090c2e5013275c3e49d1a9cc8d8/piliziwesamutifuw.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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 10808 bytes
SHA-256: cda8c39c4220ecb52c71520f9e1772d2eccd4c74740a914718d6362d10d366b1
font_01_sfnt_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 17668 bytes
SHA-256: 8a24a10fc528ad3c55bd29c5c3e5ffe4dd219c03b5c98b32bc18fd6c153c9839
font_02_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1