Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3c9015ea849ad6…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 08:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24fd40e1e3c64d073acf64d470f60a73 SHA-1: 0e44266e6f927e9b20ad467236ebeabe46ee05dd SHA-256: da3c9015ea849ad6e7e7efc862f71acd5e27f52508d58ad8f0f2eb19f40d9826
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites, indicating a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/dfe2f5f2c0befc8d62216f009b357a88/guwilurokasozemafow.pdf In PDF document text
    • http://rogersdesignhouse.com/uploads/files/kagepuzolu.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128adf6e942b---doveziwovegabeligiba.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8f01940ff3dfff27fd52e8801fffb1df/78142398692.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/ligegilefamodetur.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/88818606da7d350abb5d14d99ee14caa/9747671989.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f4181e59c---36977064545.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/3800423903.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1d549b8299f971b07b88af707c5f9757/34248025641.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/115c0ce4f1b674241ec8d31c15254acf/41935473017.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/sepiti.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/76615910821.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/74a4d87322b302dbafa753555df2f079/75798810658.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b6ce2b1c85ab78a0d2876e531e54391f/79318399155.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tunusifoze.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/dobaruxexiregabun.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/punozusog.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/42212150242.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/fidojometusapijo.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/mifizivir.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/48271074570.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/timumuvoxalutiledezone.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/jazewikekadewofevozix.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/94901be18b513219e2335498dd3a4489/zurafoposofuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+soldier%27s+creedPDF 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_off0000c2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E5 15992 bytes
SHA-256: bad731ad438465ca68a72214c845cb2526a21ca3622f23e0196ad178448f41d0
font_01_sfnt_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 10100 bytes
SHA-256: 0fe5ac50656d33ac7daaf54ef4cbdf6a6d61d6760162d88c49501d1d712c765c