Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb373d859d1d716…

MALICIOUS

PDF

89.6 KB Created: 2021-07-28 05:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50b490ecae379d1adb0b5010f1bff3eb SHA-1: 034c96cb2bfa0827d7dafbf414bcdf3449a4cc9b SHA-256: 6eb373d859d1d71698c95b3d692ccd448f0781434ec8e711322be9183985a74c
204 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of a 'download button' lure and a 'password-protected archive' heuristic indicates the document is designed to trick users into downloading and decrypting a malicious payload, likely to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609848584a288---15745820781.pdf In PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/21951222249.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/nudaroxajivozuvudujo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1bq182548ebfffqu85gv8vipq5/zakatisabitixuti.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/vokojasipugusakitujanolu.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/8737065102.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/22806149821.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8f1bab4e5851edca0ded530cc0475a0f/58656461440.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/m1s0g42su3uqkainumk53pv1ig/73045396013.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e08d3762ae3---pufugiwebav.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/larutefuvafimewozilamu.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/pamugogazeduzipazaluf.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/terenuborokexepiwatozudes.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xerinonagumumarazifariv.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891320ebabe---4618430376.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/menaf.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a39d3fd4d6c---76107818045.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/weguxugimonozeziwudora.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/39361262792.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1ge9u6ldj0k72gq7oldgrq7ge6/vogunomemolirineraz.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/tuvijokowijuxonavaxokoxe.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/busimuwonakelinu.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/bc6cdf14c13be48ee2ee864c113f653d.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084267716f53---vomimepolezasubu.pdfIn PDF document text
    • https://invest.pl/userfiles/file/84216725557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+gta+5+highly+compressed+200+mbPDF 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_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 11680 bytes
SHA-256: e1fbdb907299d67b84ff82681763e5d9240ff07de587ff056f0149dea2c1e374
font_01_sfnt_off0001113f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12951 17628 bytes
SHA-256: 85b2004f70735252ad1d6e33f0f609960a108e9169de251361f290e012b0ff2c

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