Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f526b5fd0da7fd…

MALICIOUS

PDF

83.8 KB Created: 2021-07-14 00:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9fb409a97bccd7eb80fcdc1d6d8605f SHA-1: 70e2078416b6db2681f06bbffba208fed275327d SHA-256: e6f526b5fd0da7fd2a6b0b97d936b2f5098e680e33a1249c861a985faf00f573
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites, many of which host other PDF files. This structure is indicative of a phishing or malware distribution campaign, where users are lured to click on links that lead to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d010c6e4401---fukeme.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/57603619276.pdf
    • http://christopherspubandgrille.com/userfiles/files/17233945641.pdf
    • http://maynenkhiinverter.com/media/ftp/file/dosijere.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8d8806d290061a49aea12214bd83f62/dogimifozutivupajuwu.pdf
    • http://bachova-terapia.sk/images/file/2549916466.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qa1r2kml944d16r57okku7m4c4/norumeduso.pdf
    • http://vidol.nl/userfiles/file/bexebejuwewe.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/cedcaf1be43ff43c21b0753980b8ff23/pavater.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e73607071---kapujubizel.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098397798c31---83422585212.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/vifenag.pdf
    • https://cochleartudaskozpont.hu/files/36490739940.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/n3sljhqmuouprvpl5f42hsi6jg/foweduzuk.pdf
    • http://pcwenhua.com/uploadimg/file/16242804381732702445.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/dajilekozovesasibizisos.pdf
    • https://himalayanthailand.com/image/upload/File/petuvaginirid.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afc85eabce8---lasotoru.pdf
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/69273283032.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dc1b41f62---linoxiwoxopujoka.pdf
    • http://breakevenpoint.pl/uploads/editor/file/76332929778.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e83c8247fd2---86153193666.pdf
    • http://astro2sphere.com/admin/images/file/jipitikoka.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gmbf2341vb34t42a1pk1i91l66/60228316958.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ed63639139e---gaxetejemukevipuf.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3b4648f2c---90966017353.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bevel+gear+used+for
    • 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_off0000e498.bin
d81c9b073294e9d58a97b3ae3831b78eb57dbc210d08419ca3ee53a6cc199c36
pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 17224 bytes
font_01_sfnt_off00011200.bin
6b8fdefba8f9f528ebab5bf2cd5453631494180d61de87aa784ad48807599c69
pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 10456 bytes
font_02_sfnt_off000129bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129BF 16792 bytes