Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61a6240e2a35daf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-29 05:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 53ef98a65dff4455e01edbcbd6f6cc80 SHA-1: 7e5bfa6a5dac26b8bbe2964f16b71443afa7aa5a SHA-256: a61a6240e2a35dafc6a7a678b2226c1754e964a9c45e23bdc52cef23564843a4
156 Risk Score

Malware Insights

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

The PDF contains a link farm that points to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kirsanov-maslo.ru/uploads/17826154634.pdf In PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/7165931419.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/85mbj2ued9jlslg9usm4u0ok1k/gegarux.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/zapezuvifikeruxis.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/xibipixinad.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613191c446aa9---mazupawixumugazozizuxuzez.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/87494578016.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614015b7d4479---vakufevu.pdfIn PDF document text
    • https://il-gusto.com/images/file/kuvanawuwexekowamanitoja.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/woberamokesilagurureku.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/pebisorodanezexebimide.pdfIn PDF document text
    • http://17njl.com/userfiles/files/gasefefevogibudixobogip.pdfIn PDF document text
    • https://mcsfood.com/images/file/99411913011.pdfIn PDF document text
    • http://metallpress.ru/files/40723132064.pdfIn PDF document text
    • https://adikkedua.com/contents/files/rodagudiwevun.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/56421770607.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e9440be8da50f95319fa85edffbdc851/95916486540.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/28433683116.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/34707011736.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/56584881594.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b597d0315d---43639691432.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/45699215805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+turn+auto+update+off+on+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE1 10452 bytes
SHA-256: ae510a26549f3bb1fcca77727f8652aae66c523aa9a9978f7f0d9fd3d6657ae1
font_02_sfnt_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 19200 bytes
SHA-256: 1c483c8b31b231274731cf34577b73e52b8745f70f2c8ddfcce830384215abbd
font_03_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 19096 bytes
SHA-256: 18006bf564cde32fbcd86b82e0c90788e1538c43a8803fe29d67c9df3197952b

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