Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c3a3f19f899888…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 10:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cd9ba0400925cf177b623ab544aad54 SHA-1: 95ab152b20fe3afd1293bb52c2a601c3f49203f4 SHA-256: f9c3a3f19f899888af68b5a4599c5564b2fcaea7a2c3415e66d31424c93b1a70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://chcial.ru/uplcv?utm_term=the+tower+of+nero+free+pdf PDF link annotation
    • http://theofficeplus.com/userfiles/file/19863041697.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/zinala.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/bobebubibuxivef.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/wefulez.pdfIn PDF document text
    • http://novafish.it/userfiles/files/wajozokokijegadunobigo.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/46745677972.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/35414138556.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/jisuwenonew.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/goweganinom.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kerore.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/5109501745.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/77871380731.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/64ac57783803a6b58553cdf0857452df/54470427651.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/bogedimupusufegabutuxe.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/60082886450.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca77f606c1---21071175597.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/tojuwipebiji.pdfIn PDF document text
    • http://pnalog.ru/images/file/venukosopowulojufes.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/96472730164.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/64787514733.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/90058651601.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210906135408892178wdxib1.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/22171299257.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed79b5c21f---694662603.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_off0000b498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAF 10176 bytes
SHA-256: 26595f7f5bcb8ada335c0fa194cf868e83f85ca94be4617107be9c5121028b45
font_02_sfnt_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 18356 bytes
SHA-256: abfcdf9abae953033ad0b60cfdca35a4c06c4882ac73336b18b97a4630d3d875

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