Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d8f9e978a1d9a8…

MALICIOUS

PDF

89.2 KB Created: 2021-08-07 06:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bba4cc1130597533d28abd4f95635bff SHA-1: cc239905883538eb187fa9026012d3e2f7c339bc SHA-256: 94d8f9e978a1d9a8afad28e8d37619fdfcd4951ff7ddd1ebb808a5d773aff3ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI indicators and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=formula+qu%C3%ADmica+%C3%A1cido+linoleico PDF link annotation
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb111c90d35---tutibinisila.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/pakabukenefaru.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb68462182---jewuti.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7f459fcac4f4e7ff8ee24836c5f29b5d/digonidorebanapalat.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/jenuraziposigonebadikine.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a2ba3dbbbaf628d8fbb12ca1df051f4f/72533677471.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7b88e0c4de787f19a6fcd161c57b5d99/sozalofitozopemamiz.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4578d2232---pidaxaredewifomobolivu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607611245f27b---74794193479.pdfIn PDF document text
    • https://educhina.mn/editor/files/91107633332.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079999e3bcf4---fuvogufamas.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/baxadofu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6b914e607---43083022465.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a48dc51a7d5---27917199138.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/89254439102.pdfIn PDF document text
    • http://rld-carbon.ru/file/18246909870.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9c1d491ef46a22198f0fc08d706bb2a3/81493403842.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ead40f45f---58919841175.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a0e51e4d5---36820679266.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/46399652641.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b33277411b86514ce16da80fe85bffb3/godavebimazubududu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a477a866bc8---30924128999.pdfIn PDF document text
    • https://anfauglir.com/images/file/19705801922.pdfIn PDF document text
    • 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_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 10728 bytes
SHA-256: 5c86c20de0e2e978c074d3c9aea981ba90dab0bc6142bb0dd4fbf50332689201
font_02_sfnt_off00012879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 17328 bytes
SHA-256: 268edd70f14c2d6d2a8035186e285a9e76f26ee2a1aa4cdf36f112f438bdf0f8

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