Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb42c833599e9bd…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 03:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9da86ec39db65b0b1f4d4d9b6481a973 SHA-1: 6fca057e80594895548ade6fa42d1cf28502b778 SHA-256: ceb42c833599e9bdde72d7defd68dcc3722ccb7b0934346b6d34de87d50ace24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://catamma.ru/uplcv?utm_term=how+to+change+keyboard+on+messenger PDF link annotation
    • https://casasholidays.com/scgtest/team-explore/uploads/files/10203981405.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/20302589002.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613344402d4be---xukapivetizijes.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/dirokepifeduguzu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147c4cd23303---pojosaroriwamuzij.pdfIn PDF document text
    • https://architektor.ru/uploads/file/58567885700.pdfIn PDF document text
    • http://headrepublic.pl/images/files/vilamuwirikumemuraba.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/fofotevizopuzu.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/vususil.pdfIn PDF document text
    • http://etkenkalip.com/files/mijeton.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/12861947756acc205a1d4bcb2fedccee/borewotazavesonamivujifif.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/vurekulagisepemoke.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/30616728376.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109061029362149.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28541615964.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/xugovimimab.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c2bfcacb7---baxofaregobo.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/foborupew.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/sekunekakelavogo.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/42615124229.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/68183904216.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/rovufuvifarobenof.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5f8661377f894022eac2a45639281db8/45849309614.pdfIn PDF document text
    • http://kaies.cn/upfiles/2109092001232805649ndwi5.pdfIn PDF document text
    • https://mackbeks.com/files/file/muwutipab.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_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 11100 bytes
SHA-256: 20eb546bd282a4ee73a49236e75cf1d803f65803fb341dfa6251088590e6de0b
font_02_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 18416 bytes
SHA-256: 4a3cc748e960a1ecec047050642ff4a39c10d603a44b6596245cfb10b5752917

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