Malicious PDF — malware analysis report

Static analysis result for SHA-256 d279be2d949c4745…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 22:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 709bd7cae26fa19951ca4cf602a6e92d SHA-1: a3d1b1229a15bf6a71286dffc59356fc3685ffa7 SHA-256: d279be2d949c47458506eeeb6003213cb8484245f05e9ca3bb4a0b2ef2221840
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The presence of a link farm and the use of compromised CMS uploads indicate an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://creativitagh.com/pevron/www/img/file/gafijojijiwakibo.pdf In PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/0d85j3r87vchuhne18gvcpsdar/78964876604.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/pavibepibixijinixarip.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/wowutikubovivununi.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/32316718995.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/rabugaxumetifufumuk.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/40998486972.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/16049797972.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b3afb66b7---juxununizimi.pdfIn PDF document text
    • http://minhanh.com/files/68302548629.pdfIn PDF document text
    • https://inncredel.com/uploads/81508979008.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/20004459800.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-8-8/20210808200644612342.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a2b98a52578aaadcbaf18fe16d9ef655/gesopomexur.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00a900f85---83872252557.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/cc3766f6bf2dca64d9ee312728894a70/17817602233.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6eff8a285d139190a4657d12de1c8d8b/lobesadamanari.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1611e849d43f00---tamugaregimeremizonom.pdfIn PDF document text
    • https://adci.vn/data/upload/file/65545030473.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e231e61826a---tabomutuzazikuv.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ccd25f9e4736f79ba0161c1298c705d7/bozipezobelamupumesig.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/tixabozebe.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/74624700797.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec4ac62ff---dorazelaxafed.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/loketidevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=magruder%27s+american+government+answer+key+pdfPDF 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://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_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 18052 bytes
SHA-256: 2756a89e21d4b50c1d19a3acf656ebe142b677405170af0c1dbc0116b5c96145
font_01_sfnt_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 11400 bytes
SHA-256: da73096ef01470b0921f2ef704befa78e8b74cbcc0f358974d8a3bb19c512ccb
font_02_sfnt_off00013ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1