Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7cd255ab577581…

MALICIOUS

PDF

71.2 KB Created: 2021-09-04 18:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9dbdbb330a6f755505371d8b70f5efe SHA-1: 408ca41ef5e872352b176312fc9d9ac3a8d66fea SHA-256: 3c7cd255ab577581f79c413cf83e7dedad9a53945451ab295ec473cb42c3b6e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. The PDF also features a link farm pointing to compromised WordPress upload storage and other external URLs, suggesting an attempt to redirect the user to a malicious site. ClamAV and ML classifiers strongly indicate maliciousness, consistent with a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161272b8d0148c---pupufuki.pdf In PDF document text
    • http://mxagproducts.com/upload/browse/file/53569712602.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/losadovav.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/jumubuvobetaxezoxupopotu.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/30692926476.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/fapuzugofodixomobazolo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/83fa18171838e8edd3fe534bb31ee0b5/munaguma.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46b87b988f---46313730082.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3a4ed9bc---femujubebumox.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/jasaja.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/95onnvppc57ep3h83m4q3jadgk/posolinegukij.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/vogewuxopulapuropakapeb.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c591a5fbe---malamokakapeketejorun.pdfIn PDF document text
    • http://patroha.hu/file/8687416631.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/vinajijatumapige.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c845a10d1d---54791386144.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/vejike.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/dopozut.pdfIn PDF document text
    • http://iucecb.com/files/file/58158944954.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210507112552.pdfIn PDF document text
    • https://etadelloro.it/images/file/81860789261.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/34001829247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wancle+sous+vide+cookbook+v1.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_off0000b577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB577 15688 bytes
SHA-256: 00ec8853f8c4ec0dc4016c89ab8e75d95c4a74a83ea7f4af1dea626f4a43d529
font_01_sfnt_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 10924 bytes
SHA-256: 672555ccfb85144bb4fa9a67713cff10c5b432238e834d56232266f99b7e06b5
font_02_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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