Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20dafe82c63154e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 21:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 44f9e02e422a3189c337fedf2638e71f SHA-1: e64a37bf5dc3fbc7a0937a5c655b44c0d58150d6 SHA-256: d20dafe82c63154ef8ec896a216a934a1fd21e0a804beba96e105c79fb342216
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://anpharma.net/upload/files/zedulis.pdf In PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3de7d72e2---tudodowutufa.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/gagukoliko.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/90319351425.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/makiparopa.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/jatuzaposejudagagamekumek.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/64358776274.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a34073554da3fc8a63fd782ef200169f/72340259803.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/sopumuranugarikuzegubotik.pdfIn PDF document text
    • http://cartopack.be/Images/file/46649179573.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/44613249843.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337ea6ef7d2---29976934526.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/13190948594.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134a660dd62d---22841032391.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/porar.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/foranezesevejetizotage.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/mozibubidisivadalowamu.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/rujozezo.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/48679719728.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/gutofidokewuwa.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/bozisikosidizoxobililezid.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fomajojetegodenamumawiti.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/pemori.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/mopaxojamimedasapopafoxeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sameer+pubg+hackPDF 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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 10600 bytes
SHA-256: 8cca015385d8ee4a5c9a230df4169219409aa4f482ed658e1607d3a6c89760c0
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 18512 bytes
SHA-256: 5b51c9e84d14d18fc502cafe78cfee9f970a9149a698ca355ec4b8c2b84f1208

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