Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a7ad76e18d50c4…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 23:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d571739da1cf37342ed4460e52a179ad SHA-1: 5b8fbc745576d465e4afc926adfb1a8e9d283703 SHA-256: 65a7ad76e18d50c40b9b8aaac8c22bd0d62702ad4c3bf84ec83c5166e3bd02d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://worldmedglobal.com/userfiles/files/99352652908.pdf In PDF document text
    • https://fix2go.info/userfiles/file/dajogajadikamove.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/84118340999.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/89024465492.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/lujenopa.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/lewumubemer.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/wusudetesibejalo.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/pefamunulidax.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/sudenavun.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/dujinotigevadetalujava.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/22805459361.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/7935225766.pdfIn PDF document text
    • http://lejuriste.ru/files/file/7501153469.pdfIn PDF document text
    • https://davnosti.ru/upload/rivomam.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/60305218acacc88b67fa7a51be73e110/xomapi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161412dfa31814---50969821010.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/59969648041.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac524071cb---39920881326.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/44509900961.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/pezoturinibupe.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/laned.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39251582274.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/48676251007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=123+films+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_off0000ae42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC659 10140 bytes
SHA-256: e03ec925a936e6ae5a11d910600609f571ae2fc9800bce79f5fed7f2d30391f0
font_02_sfnt_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 14896 bytes
SHA-256: 5fec189738e285297dc7db3a81087257dbeea609f44116d8d806776196830e2b