Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc9856eef0b1893…

MALICIOUS

PDF

89.7 KB Created: 2021-08-31 19:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bd60c5b2162cb19fe97860fc4596ec0e SHA-1: 7de4ccd264a4f476bb8e7ec24b204a5157cba9fd SHA-256: 7bc9856eef0b1893282a88919a52938bd3fad88558b4cbe548cecff74183bd6d
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dsraxys.com/uploads/6507529159.pdf In PDF document text
    • http://richwoods1969.com/clients/861079/File/14672140614.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/84239504846.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210820104350.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2308d91393---lefaxapogodazilege.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/zutidodakugavukibe.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108769f9ad30---votajikepotefum.pdfIn PDF document text
    • http://teifsepahan.com/files/file/11779559284.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/34503386313.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d171195c8---tiburapaja.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1n3plhofm2g6pg74iurrtvpen0/78139055192.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/82efc6caae40a662c4da3ebf6d1d5b5d/58670417497.pdfIn PDF document text
    • https://webmenuplus.com/images/file/wofofa.pdfIn PDF document text
    • https://laser123.com/geektic/files/56276815158.pdfIn PDF document text
    • https://businesslife.com/content/file/dinumivaku.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef4d748dce---56317618191.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/64839541384.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7b1e15e43b6e4d7d6da6fca5737fe021/15194195543.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210527_8BD5E4B3E4C5CFBF.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/nunet.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0816e318---zusifer.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/7023502d1e2982a87dd3af640a65acf1/79826309727.pdfIn PDF document text
    • https://dhesient.com/media/biwefajulararofironaju.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5b8b14fbf782a00907b88db8ffcdc9fb/62430881407.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210802_222921_178.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/12701603389.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/71ec50ad21fca9405c0b5083b50f7fde/66490783262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fate+stay+night+visual+novel+free+downloadPDF 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_off0000f0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 21088 bytes
SHA-256: 0a23239ab9534613f69cac7331f87a462930ad920145b5e6b18c6d77eca28fcd
font_01_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F62 10976 bytes
SHA-256: a2edd6e928b7eb932adecd0720fd6981add66322aa513b0bd7eb3c9b54ab815e