Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeba9f316e30240…

MALICIOUS

PDF

73.3 KB Created: 2021-09-30 10:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18585964db47356ea13f7ef1a9caf73a SHA-1: 505f66c02ed8919552ab8263771632abe4d06dda SHA-256: cdeba9f316e302403ef8cf0fd357240366ae62018c676c1e938b4d75443a808d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=remote+access+to+android PDF link annotation
    • http://aarogyamedico.com/userfiles/file/pefuxij.pdfIn PDF document text
    • https://redfortfireworks.com/ckfinder/userfiles/files/34408023022.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///sumefazumikubudokibolivof.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/12196951954.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6tlr4lchkm5d8cfs1tlm6pi9kv/65511344812.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/xoxowebezofozuxenixefe.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16144a33876635---tazareguxedudosifaf.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133254ab0504---dekumemamimasawugajuwixo.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/wewijorus.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/tamibajodi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d25d72399d---48920879468.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/wedatuwij.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161537ef3e81a7---20938019673.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/14rrc5bn0jg760nbmal8judrih/rovopujanederomis.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/rapozugesizig.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ce77be0f0---tidamepomapofakaguba.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/gutopudapunuruxujiputet.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/wixubuzumeluzapesix.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/dodazalagib.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7808a01fa9c233afdd45a4525274b479/61278820896.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436cfc80535---51077903184.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/panuk.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/zevezodubij.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/7105815631.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_off0000babf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABF 17276 bytes
SHA-256: 750f14e8c2da226e8a5e2f2484aeb66765cd798e5fdf56a3d6df861fa95f7f22
font_01_sfnt_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 10532 bytes
SHA-256: ab02c0a7facf3ab988e90e66ca405f2a3c5af244662b765fd334c0c5053d31be
font_02_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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