Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a97a276ae1762e2…

MALICIOUS

PDF

94.4 KB Created: 2021-08-01 18:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: c6d42a6170bba346fe05ea8ef64e78da SHA-1: 510d60a7b35e77d68b122e04a40b79da48ad8108 SHA-256: 9a97a276ae1762e2048690f132b62415bffc334a8fa4193a1ee52e0289e73d23
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/toginujisemisojo.pdf In PDF document text
    • http://aimic.com/userfiles/file/45406344595.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/7231951867.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f8d0f9e163accf505c8d34ef30622050/tilesu.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/pegirujefukesuvufijeg.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/zanokabelewuzezadigizoxib.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39aba87559---52136406015.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607611b548f1e---wujabobuvajulage.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608168c8cb747---75599020927.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609870e1d3c93---32533930122.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/e3e0a80dde95690e4910bf0f67e1dcc2/ruxawejawuloku.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/192fe928da8b9c541800bd34dca348df/kozisunuz.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0a2cfde633dab515c404fcdb53cf8e75/90922363731.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/54770329306.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/35860802236.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/534d8acc4e1ffbe7dd71b4a9849fe164/35901192408.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/01a408d952cd159f71395a23ac61bebb/foxosabafuvudumokobafasi.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/dobapibesukemerajaxekuzir.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b11562736---8967102621.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/2913603809.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/40290041286.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/63389678694.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/polironodezokipaf.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/7368673926.pdfIn PDF document text
    • https://ms01bet.com/contents//files/90399961336.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5ohgh3e687v7k6ta55utvkhot5/megeboxireximegugakuvoken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=install+lineage+os+nexus+7+2012PDF 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_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee
font_01_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 17244 bytes
SHA-256: 7bea5af3c8a4705b0971b0d88c476b42a26d314149d3fdd2064038f164540631
font_03_sfnt_off00015176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15176 10680 bytes
SHA-256: 47c67c1f71802ee6c63cfe98aa19422ea327456fe835780e867a61040cd86f8e