Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef63627b65c0e3f6…

MALICIOUS

PDF

92.4 KB Created: 2021-10-06 19:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7597243d9860a2d2552015fcd0b2652a SHA-1: 0349481ccca8978d5d6c7170168e239bda4b20da SHA-256: ef63627b65c0e3f66c50cda995103d295abc185a8913ddf88aa697b0e58e6486
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and link farm characteristics points towards a phishing or credential harvesting attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/07f0448d01166528640a81a742625953/55063658336.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd06c4db4---dojupapibezaw.pdfIn PDF document text
    • http://gr-chem.com/upload/files/58047415483.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/wiwobavibavamubimijig.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/sofojitinunujazoxegibokub.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a08b8239c---pigurunotosodasulerapen.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/3019284d5fb8837f194b1f368de39e71/25908080439.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ef2064474e17e6be04f437eeedab76c3/nuzebu.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/bojiwirifow.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/72306346788.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210901_C5CFAC6C06E1C1E9.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/nukowolujolowunot.pdfIn PDF document text
    • http://ihdbd.org/upload/files/96355107820.pdfIn PDF document text
    • https://proia.bg/userfiles/file/68850772695.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/wozeruvise.pdfIn PDF document text
    • https://miminku1.com/contents/files/51631318883.pdfIn PDF document text
    • http://sushibelovo.ru/files/webujozi.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/wopowuve.pdfIn PDF document text
    • http://master-br.ru/img/file/63871205923.pdfIn PDF document text
    • http://tradotel-riviera.com/file/98516155668.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51616046386.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/xawevinuvo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615669e42106d---getonotaburisunaxofefuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+demiboyPDF 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_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 18564 bytes
SHA-256: 65703c8190ffdc8a7a8a7f234681ca3bdc1544f1730a69a3d1e3481ef85e0585
font_01_sfnt_off000133f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F3 10532 bytes
SHA-256: 3182129fe6275138642d7ed1a20e3ecd63106c03bf1443ade26c980ce442abd5
font_02_sfnt_off00014bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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