Malicious PDF — malware analysis report

Static analysis result for SHA-256 6effe0174c274662…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 04:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7cabc3917ec9633f34c35168cae8414 SHA-1: 1c5e71626c0eb4aa3a5bc1fad57a02872d1670db SHA-256: 6effe0174c27466225061b79abb57eb005b8f97936e17a317c0109b180ca35e0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms. The presence of numerous PDF files within plugin upload directories suggests a pattern of distributing malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/04dc6e84b94ce87dff87232b17c06aa9/7139432531.pdf In PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eea680fa7---424321146.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/pawudumagonigof.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/32656852630.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883ded829d8---fezobup.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/53124958581.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a4d3b83192---rumemibotapidorovelisukox.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160956c8b8914c---15184203336.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/c867df1ea6d915ec9cd897bd3224724c/duvetomupadubuga.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bba5220cade7d84a52bf15d75e209bcd/40105551672.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/kudirurene.pdfIn PDF document text
    • https://zhansq.cn/upload/file/kiraraj.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/87179146391.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085041cf11be---89939004455.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-8-25/20210825044645532131.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/ce2c4aac0b2c46d4c08fa35c3d1b91d8/1693347425.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/53973419158.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c70abef23---jafatot.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/98376301907.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/18812810238.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/48330675945.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/bedopamurawo.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/duminurapagozojonetu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a23abcd0---29178297738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+1+com+crowd+cityPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C5 16380 bytes
SHA-256: 4f2409aa88bf6b583f4c224dcbf42814dd3cebad97f75ea1cff0e3a51ef31032
font_01_sfnt_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 10256 bytes
SHA-256: 5ac4c7239581c82924ad5f2175b4807d43b741234547bcc519a00eddd465111f
font_03_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 18488 bytes
SHA-256: 3ba6288df84f818be7ed93bf57d92d51e843712a55fd48c8fcd27828e4b03a7f

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