Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd4827316d29487…

MALICIOUS

PDF

73.8 KB Created: 2021-08-29 05:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7acb0f7a759b93ac53d64ebbd0b30eec SHA-1: 50c2de8422ec7d44498cbc4f4da2c06f7dbe44fe SHA-256: bfd4827316d29487a6c21778bf39e40957695b9a20f9a1fa0b68e072c1d5e5d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a56a78e94---72771501264.pdf In PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210609_A4225FED12A9748F.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19e1d7031---pijufarojo.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/64477919367.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a4899f49ce60095d946c02b34768bb87/41194751519.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/99217671950.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217baa7383f---rinewa.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/lafadirobewopo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/advl4lm5vqf5jpg9hsn56a49sf/47328829319.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e8220a461fb6c12437fd263d9d3d2239/56633371349.pdfIn PDF document text
    • http://siembra.me/uploads/files/66737440030.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///fagifuwuvum.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/66154671508.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/lkejtmp19miv66sbgdge28g6hu/pitaniz.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/xidelilavukujudavimumiseg.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/55472174716.pdfIn PDF document text
    • http://henca.com/files/details/file/mavififatir.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/44056001600.pdfIn PDF document text
    • https://digireg.li/upload/nolapas.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/11dc4964184e808a06c73772d753a5be/48153676556.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/popuvoraxugitadolekot.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/wiminul.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/32820476856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=multiplying+and+dividing+decimals+word+problemsPDF 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_off0000c0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 11356 bytes
SHA-256: 0d46af8fb80b08fee77214465b5509ab7470ffe344addb18efb21d5eb24aa25a
font_02_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 14856 bytes
SHA-256: 6b8c7e2f0a82b08e0c093a60103eba85af7301fb90ee06e6f56927d5d5016b50

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