Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea57561be2dd4ca1…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 23:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c77494af92781c6fc1f43d2d661fc29f SHA-1: 3a93b7ed1cbfbd04d2ad10959a8f7c5ae6cbc7e4 SHA-256: ea57561be2dd4ca174306fbb9576697db81e02aff967885d053bf93b32f0e8cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate the PDF links to compromised WordPress uploads and uses disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the redirection of users to malicious sites via the numerous external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/84775874437.pdf In PDF document text
    • http://viethanit.vn/hinhanh/file/madujixoworuzikebix.pdfIn PDF document text
    • http://wjcopy.com/upload/files/7410719637.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/xoxowugafu.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/76072298529.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/malef.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/12091392042.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/15924014109.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/22607236123.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/ketave.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/jufagisisetowumo.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/98812027846.pdfIn PDF document text
    • http://tano-cable.com/d/files/15520473326.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/tifonisutidaluguzurepo.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/jikibakidaxazadi.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/towixepixore.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/nadizusimekibufen.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/dafupuvoduzufefulirol.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae69b11924---jemojedapipake.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/65013275741.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/beravuwipezagejidipa.pdfIn PDF document text
    • https://produse-zilan.ro/files/nanemanopixefe.pdfIn PDF document text
    • http://dolgoprudnyj.inhome360.ru/admin/ckfinder/userfiles/files/55777228435.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161450cbb1238d---35755973499.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109201624298509.pdfIn PDF document text
    • http://come2menorca.com/images/file/50623779159.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/66581562197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=como+ver+la+pantalla+de+mi+android+en+mi+pc+sin+rootPDF 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_off0000b68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 10772 bytes
SHA-256: 9863272fdc900d8f0178bbc9827b6ccae83b5dc4a1ee6e0c35d2344f80c8bddc
font_01_sfnt_off0000cf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF53 16912 bytes
SHA-256: 3f1fef547baf14f9e171a3c681968519c6711944a2c6e3743512f74958e1f550
font_02_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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