Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddf00bd94a0f764…

MALICIOUS

PDF

75.8 KB Created: 2021-09-21 05:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf68b2a77534192a9a77021377551f2b SHA-1: 632ca71b23b826024c4674e3705cac1958c963f2 SHA-256: 9ddf00bd94a0f764e38da86cfbb2aae25b714032bfb2aa52998ae3f6d3d08ee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule suggest a deliberate effort to distribute malicious content through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=transfer+bookmarks+from+chrome+to+safari PDF link annotation
    • http://pasaru.com/upload/files/disog.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/43988591786.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161458b063b4a5---medimabowub.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/43996077082.pdfIn PDF document text
    • http://robbes.nl/media/files/buzofigakeresikitavizuluw.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/vuvutivaxiladadejunajanis.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/qmg3fo30e40j9hqh2v8babsfr7/95960271113.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210920_155943.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bba2900e54---45585262465.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/21091310050917314337zsfh.pdfIn PDF document text
    • http://agama-rc.com/upload/files/lijovumerobajizadifaza.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/77219364163.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/veloneteni.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/f9e280e388cab875b93ca454a0d7d020/nunen.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/71e37eca2fa8ccad672c1d38da40f0ac/mekedi.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6149128791024.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/93357485013.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/37223002746.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/xiguvukuwamuvotexiw.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/61108583507.pdfIn PDF document text
    • http://santehnika34.ru/images/file/10597928020.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc8210572---46081486169.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145e5518fd3b---78102962666.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/1719179175.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/wilalenomuf.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_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 16200 bytes
SHA-256: 9569a4d582539fbb3845d378e86c5a95598766eb9bce26bf30be6017c35e8cb9
font_02_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 10748 bytes
SHA-256: 51f42c53cbf7bc947161979206f309e8b9a60e39575a706a4a5e7db87426e55a

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