Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4b7c3dd83990f7…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 05:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8d559392b83e3529326b184a983a27f6 SHA-1: 27974bad72541cea5bda7be16b45f0ed1b8f794e SHA-256: cd4b7c3dd83990f7728ac4e30588e648ab39283170405b5261c2e7582c613e27
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and track user interactions, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/44e9c98f0fd46accafb23442af7e0f0d/91343995323.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/diblh5d0mujj2vehtb15h60rmh/55721875977.pdfIn PDF document text
    • http://bestcareloan.com/ckupload/files/60177292890.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/32869461519.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/22106902488.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b13850f318f---71933087448.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/1445101511.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85fd105e58---mewojul.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a59cb79bdc2---60259320237.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/401de96a084eb8c62e4838a5061e7dda/wigiwedegejemogudoga.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb802bb04e9---92620031814.pdfIn PDF document text
    • https://irrisyst.eu/files/file/14293466207.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/zaxajoraz.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/amr677ojoagrgnhie8bv93823u/62019830778.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/vefelufefinarulerubirodim.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/lijibavureruroruleweso.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/dcdcb5e7359644e1a843ad81059d8a5e/ludazuba.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/84900979566.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d406e3099f---89154117061.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/kezexaguzuwa.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503205437365229.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/41993452087.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5jsi5r69amtogp53bm2ui0r0r4/gutawedowavozoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=white+holland+lop+bunnyPDF 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_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 17088 bytes
SHA-256: 37fc2788c12f26bd83d2dd9dad5758449e90509c7a2eaa9f32d6bbdb2c2359b9
font_01_sfnt_off0001179d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 10568 bytes
SHA-256: 20bb319afbec6a1780f8f59f51d448dc4463bf335ae9caacbc9579d255643f43
font_02_sfnt_off00012f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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