Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47b9889da220bd7…

MALICIOUS

PDF

94.5 KB Created: 2021-09-01 08:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acf7f7c5a36e57736c88e96b63782b06 SHA-1: 06e555996c40837bff4a59f11d4d36e9f657541b SHA-256: e47b9889da220bd76fd57da866eb3e45d1801d83b5da2b96debd95ebd7c7b565
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://zhhyhb.com/uploadfiles/files/76807085099.pdf In PDF document text
    • http://maychamsocda.vn/images/userfiles/file/timigitemuvafen.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/93872571733.pdfIn PDF document text
    • http://apcmagon.com/userfiles/33729420140.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/if6amrf0blrjhubv2m6q8e2090/42925404942.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/48f8a6e0c7f8e0deed13e243c5809ee5/nuweti.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0c1c5d2ef259b9a752fd7baf5dd83b90/91796276713.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/timosenasi.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/guvaso.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/23c2bb283c5dd68998b872982c59f0f2/21184801668.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607f091868997---ladajugen.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d40b82e1cb55303743f41221ca4aee7a/26725622795.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070454d75923---22309365296.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63430624377.pdfIn PDF document text
    • https://cecprint.com/images/file/88076550475.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/43097943201.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33726077924.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/3u5k2jv7in5la46bc1v8mc7sk4/92886516584.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6121a0a05f693.pdfIn PDF document text
    • https://digireg.se/upload/jetenagufopuzivesibi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092c03c69a00---23830696301.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/namunuvulamesigurilat.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56d101860---tuturoxoluxekoxesajexor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=woy+woy+meaningPDF 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_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 10232 bytes
SHA-256: aade74c7406a1aa3b73edbaaa5f471dd961badddf3c67f5d1505489436b9da90
font_02_sfnt_off00013d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5D 18372 bytes
SHA-256: 36afdcf33c10405e667ef9700742a8790e5c0519d39de61f3e320da89ff326f4

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