Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a727a3ed3c84dc…

MALICIOUS

PDF

74.8 KB Created: 2021-07-26 22:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87752a8b70994242b60b3275a695bbb0 SHA-1: 29ee83a9431fc302485e2c42ee1c896ea66e05f2 SHA-256: 33a727a3ed3c84dcc477c7f8258807756947d780190e35676bd3296bdb888ec6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c926693ecb---46111111831.pdf In PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/39350456912.pdfIn PDF document text
    • http://chapelguild.com/images/usr/67079120210.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/751495acb6149fb316c0fee5d9149201/83872818155.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e33d61062---52978622398.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/ritarakulebo.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef8a4ba0bc---55146021843.pdfIn PDF document text
    • https://kristinanamaste.eu/files/wubefesi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab932c1c06---1618612461.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/sawidiselinuxakamozaxoved.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/sumen.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/63bd60389c486af5b852ac4622d475c2/93082504551.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/93b547cffa29f1014e496b3d22dc5089/jomukinobinawesikizewod.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/pe010iaf1ss92j2dp0ucredi2c/67330665926.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/41862592603.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/4hs9sb08ea6ihk62u3agonlg8a/bopexonosodofibinat.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/sqcvrsngq12otg6n4638q1ink2/folakorijevotawex.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ba801ced---3848810692.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/meseguxeverifekoniposodu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc412e87b2---46777129379.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/dcf5b65f83a5d3e6b9a88b3236a0f310/22330148354.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/zopulufevuraji.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/jepuwejemobufenus.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/39282677795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=engineering+mechanics+dynamics+8th+edition+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://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_off0000c162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC162 11328 bytes
SHA-256: 41e532875f4ea6e86c285eaae8e7ffab259c51542928c279cd096d6261cc1a09
font_01_sfnt_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 15936 bytes
SHA-256: cb3a4f1c3541bbb1e61eb02ba01889ff617f9be17c0fa8a6799393f95af03978

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