Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ab188a005aabd0…

MALICIOUS

PDF

87.3 KB Created: 2021-06-30 04:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5245c6487e9308e649f8204561450817 SHA-1: d86a97d2f0c120485fa6829455fde3e8610c56d8 SHA-256: c4ab188a005aabd0db23849cf009294a53eaf8054584186b9112b2d3d5234ae0
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, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ca248f35a6accdb6dd7b73020f89700c/tuwobamusu.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be666b037ee---64440931916.pdf
    • http://a-swiss.com/upload/userfiles/file/47143668224.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160784ffc6ad41---zefokasipexafipewakati.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc3f96891---62553228170.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ottciuv66e8fkla267vfjs0s81/88805684514.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed1aa737ce---59608097575.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/28470386307.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/59c1c288f79efa9d7a19ef806a816811/kekudabobutew.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1853a99c---kidezoseduxumexulagow.pdf
    • http://rainbowcaterers.in/userfiles/file/76028101276.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f08d2d2b6---wapal.pdf
    • http://adance0112.com/upfile/editor/file/kinolaki.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a347d32c2f9---80496807131.pdf
    • http://przedszkolenisko.pl/userfiles/file/lusagogawemipasewub.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608799ead8be2---ritenagisoxago.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/30799960363.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/nasasukovapomezo.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f87e9ef548---zurawivukuwovozolegal.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b802ca1962f---merazowopevi.pdf
    • http://tlxzkj.com/uploads/file/26020641508.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079635550ff0---43556733578.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/3d9c0f0fa9a1a8c058d7d35e170b72bd/pebuluwem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=characteristics+that+start+with+f
    • 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_off0000f6bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 16792 bytes
font_01_sfnt_off00010ecf.bin
c6bebc09278271163143a6997764bd98408491a83a62d909785161cef9093343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 16328 bytes
font_02_sfnt_off000138a9.bin
baa6484a4f36c4624bd764ec9f6520bc4d3af5936d60b14104a031027448428a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138A9 10280 bytes

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