Malicious PDF — malware analysis report

Static analysis result for SHA-256 be33b9750c48efac…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 21:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a4c28fdc17fbc4c046a983772f8065bf SHA-1: 7e3281aa636282787fdce8cec161e6f6bac80f14 SHA-256: be33b9750c48efac225aab3a1ffe505587f44189211c2d277a87ebe1adac92d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern of non-clustered links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/03a139b68bb364c31c0156527835eaf8/23034480322.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607944a3021b4---35881651839.pdfIn PDF document text
    • http://german-ex.com/57510422398.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/82102734856.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/lutozimavotu.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/71975080605.pdfIn PDF document text
    • http://ellev.fr/upload/files/69567694215.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zabenerogiputoxelefuke.pdfIn PDF document text
    • http://annabarons.lv/files/files/76701405126.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/27421019018.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddda109651---zosovijagewabukugi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/77fc6d6b4a38aca8fbcf49cc0bc46638/sesipud.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/43907353502.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-15/20210515161710218408.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/35508186407.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/16efd974bcdbdb8c90bd61c6514de2b3/bitoxepituv.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/56a5419764f3f3c9a87b74b150d9d1b1/sujuwagukiposukutim.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/18127191420.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/65465772287.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e19063686---93239599747.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/08/20/file/20210820_095433_104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=remove+hyperlink+pdf+adobe+acrobatPDF 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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 17220 bytes
SHA-256: 5ad2f89ee5377876d9508184b0839a71ad41ceb35f8d54954f91e370b971319e
font_01_sfnt_off00010bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 11172 bytes
SHA-256: c362d1a52de9be9a72240ce55283637477547367b65fcc3d6b85d8431776d68e

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