Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb862e998507eeb…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 08:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f07711002673d51d152916cb196b79d SHA-1: 73277dd30d93afba42fea9d3a0209979f713bfe7 SHA-256: ccb862e998507eeb26de4df46c3f01b486147250b316fd9f7d51dc28609f1704
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://theheavent.com/userfiles/files/pebepefalodu.pdf In PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9fcb2a6f6db0a5e8c45298c4a2ea5ed0/87572712873.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/75aa37ed862129eec264d6895cdde232/10197837781.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/seronu.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/l7g1vre8dj3jikvfab6u9o6it7/66108665798.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/53343347942.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/8343964349.pdfIn PDF document text
    • https://topaldanang.vn/uploads/image/files/15501155675.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/81765115019.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609835b34d956---43990712853.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/sosifozadaz.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c60069b29---vakimedelobedexesinugu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd29e44e2b---zogunavokibajenofiviwifa.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/toxinovabefuwedanamozi.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pemodu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///82675808542.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/74110780701.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/36321473495.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f556bc36a---ginupovosoxezezef.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/fagukifiwazakurinedete.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/82226706359.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/vubatefizomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+maze+runner+2+movie+download+in+tamilPDF 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_off0000ea46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 17536 bytes
SHA-256: 226e5ede76b6c1f2262c76ae4d8b6279afd5d5fe30e114e7ae0cf965358e9abf
font_02_sfnt_off00012ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 10740 bytes
SHA-256: 1b8f6caec6c43dd15dea0b6ab06a7aa2649c3487fb1196b0405d144d1a672edd

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