Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc2c44203d8edf4…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 03:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 333a14b1cf134dc4b3c35714723b5872 SHA-1: 00eee2e3dcfcc02a030bcf5668231c6f9e613fcd SHA-256: 6fc2c44203d8edf4c329451b0e64c2c8b9fe5497b35cb6faf63bb6df154e83e9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ccedad587f95a5007eab8649ee851d6e/49035530980.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c788636d2---kadof.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b608bf7d9a3aa2c7e83f84e4cb8f22ef/mufiwam.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160920f2e0d812---fuwebojebosupivi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7060fe4d1c881aaf30dd9fa2eab25ef9/54064242365.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e36b7932ce2---52163582976.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/94559619123.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160706d8941953---wudalafajolemama.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9d5626555629c728cc96b325f1bcba34/suxefafajutevobixusivuze.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/67827177981.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0oc0rifbo6qladvm4i72pigh66/43335905957.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///witesosisudavelejasenik.pdfIn PDF document text
    • http://babamoleskine.com/files/file/6832279245.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/lasisavojun.pdfIn PDF document text
    • http://teresachild.com/upload/files/norunejeg.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/6601fd948d3704367d8d92b9377303a2/bizowo.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/98522127152.pdfIn PDF document text
    • http://1carl.com/userfiles/file/42166083119.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/24122453751.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0928c530b---wovawizigo.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/sidajapat.pdfIn macro / runtime command snippet
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/nl69s2uf7flhrme2bn1n3alf1u/58327327368.pdfIn PDF document text
    • http://usmleworkout.com/files/file/11399484172.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/nivirugul.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/89040806203.pdfIn PDF document text
    • http://salt17.com/userfiles/files/rozesemomot.pdfIn PDF document text
    • https://engravestone.coIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=thanksgiving+worksheets+3rd+grade+freePDF 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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 18412 bytes
SHA-256: 9ce79e4ee9c8050e45aa7c5dc19876af2a4483aa7071ee78e9582e5b754edde3
font_01_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE5 10964 bytes
SHA-256: 2461eface4e5b591eea50b6453ca2de5f4efaff97f170d51c8a5d79c4e948260

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