Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13888c23c8cfc2e…

MALICIOUS

PDF

91.7 KB Created: 2021-06-29 18:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bf6117687fa9d7af9eb9ec3b741a5d7 SHA-1: a17f03bf7a957edbcdab6c4597d50b7e215c8c90 SHA-256: c13888c23c8cfc2e03fe63184b6bf091cdc625d2250d5ce00faff397084ffa49
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, embedding numerous URLs that lead to compromised WordPress sites and potentially phishing content. The presence of multiple external URIs and link farm heuristics indicates a strong intent to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=transfer+photos+from+iphone+to+pc
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2a7c4e5f543bac99816cbe67856140ba/16703857502.pdf
    • http://alarcon-v.com/editor_upload_image/file/sitowirugew.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/285a0adde8dcea8946564d4d5e76621d/55655838521.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c039be6b98938dc7ca70d5b272b6612a/kufoniwiniwutolevip.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee1a58a3e5---16359416155.pdf
    • https://dpengineers.info/admin/userfiles/file/josumimugidofili.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kiwemuje.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/aio2e3mh50k3adtlsfhe4o0k03/12380644468.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080735c7378e---fupepitan.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c0a671dc13255b1e1000dad035b4abb2/rafuzadaduwin.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098579278667---mepiwi.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/cbepqgtbqmj5mpbftbtvsjoa7d/dutojulo.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4id5drlosvg9ddfh34d3p1ge7d/25685284751.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/eedc74cadc3f38e01333464cedf98eaf/77641077536.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f02e979fc9---71546500262.pdf
    • https://fokusmedia.com/images/uploads/80804918661.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/30016494392.pdf
    • https://yepsell.com/userfiles/files/55766421383.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/eb4dd46a052d6ddffd7baa472edf7f1e/nowanositiren.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jewifaro.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/74082bd9c579e9143640b2a2a255615e/84273466454.pdf
    • http://www.aportecnica.com/imagenes/editor/file/wixitenibe.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba1faf073---56465355262.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f9c2f5fdcdabe2882fc21eeff652886f/57698715677.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010417.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 16792 bytes
font_01_sfnt_off00011c29.bin
0750f7ec20b4d5aef1923754cfcccd375b6b5eafb191cf57939863be55cff28f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 17112 bytes
font_02_sfnt_off000148f7.bin
6cb4fc77a1ff2006709dd5c72c54cec522d7179d1267a55999a93175d1537905		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148F7 10664 bytes

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