Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20f10d7809c85b9…

MALICIOUS

PDF

96.3 KB Created: 2021-09-04 04:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 073b40d0a30e0b4525849c428ad21c7a SHA-1: 18c51852414ea476b08f7773f21272bfaaad80ec SHA-256: e20f10d7809c85b94ab2a5a041fc7eacfe08d1acf9c7034c5748540d0b895df8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160808d16abdf7---20954075018.pdf In PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/ganawuz.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/46af9fc8e0fe51599ce6f5000a1077c2/3876202739.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/xopewoji.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/zidof.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/69952173899.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3cc61ba6d2b5412f69bf7c87577bd4d7/jator.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/zugapazedovolanofibipexam.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/zilunegaku.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084381682b6f---45426807660.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021082709463073499.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/nozinakelasukoxusanowida.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/vumojabevat.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3da60f33e5496c671a6d314fd144bcaa/10723870500.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16084bfd822e69---86626850087.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qv99mmjpmurmu9tfah1rdmuf33/60029424241.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e701b971d---34202338890.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9619bc19d---zoxalava.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wadigegapaluvunubizales.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/482c8aeff958b934a0b78b9530382a13/97453888240.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/dawakajelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=como+construir+una+bobina+de+tesla+pdfPDF 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_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 18704 bytes
SHA-256: 9ba1cb9d5eb3c355a3a3d4d215080da00504ec366ed8a59c07978ee7a38acb38
font_01_sfnt_off0001427f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A96 11052 bytes
SHA-256: 12fed010a9cf782c0b0a830d1073db0d99d625f88dae83c818207864e498d243

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