Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09b880edaca5878…

MALICIOUS

PDF

78.2 KB Created: 2021-07-25 23:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99f6dd2d1b914c4ba992f4d3cf36cb8e SHA-1: a1b76e92c9645d361d633728b92c6bcfe165c5b4 SHA-256: e09b880edaca5878f101a09b360e01eee27fe33490c3faa32a1c297e838b26f0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites. These links likely serve to obscure the ultimate destination and distribute malicious payloads, a common tactic for phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac079da85---15565447253.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/btpoalist2pfi0hp3sjfthood5/91779819070.pdfIn PDF document text
    • https://limsurdua.com/contents//files/84901693202.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/jegek.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5b12d002b---97882298692.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/joliriluragax.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/potefus.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/rakikeragoraselovav.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb364305c---58783371616.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/32239467453.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/semesarotomegod.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/pekide.pdfIn PDF document text
    • https://aedwea.com/upload/foto/74986878462.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/49105345389.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/xejuse.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/ranofujil.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b3c4c978a---pijukevazelawasigizorug.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/83939723517.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7eaec7a7---vufujovurax.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/vupuva.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8619368e4---tuzobulod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+times+what+is+1147PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 1780 bytes
SHA-256: cf43ea07d0e14c5dadc3c8d1a3fd6347ba51c91ab3c5d9ef8ee3d45ec84741db
font_02_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 16940 bytes
SHA-256: 458993ad486f294f5a11cd3dea296d4354a09f6549dfd1d0072b4f161e67bf65
font_03_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 10264 bytes
SHA-256: 1781b6155f040eae00efb1f1fe61858d42a879647ab0998e961b439382d50fc8

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