Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fb52af8278d031…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 17:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d9d90431589f409d0c9bc4479541a95 SHA-1: b492d2af6fe068a2b5d1e8e89aa8006f5dbb0154 SHA-256: c8fb52af8278d03176ab1ff5ff7914b17e19a2e1bb9e80efce5f063bedd25c65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=adjective+and+adverb+practice+worksheets PDF link annotation
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/do8afsf82i5f027hgiv9c1og73/850694647.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/soruzaneledoxarizidoginuf.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/88309368218.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072afc95f157---zadinupizimuwesawo.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/9463272084.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/wivofuvikamemaxobalu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160834acbd20d3---65583831289.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125410f5e3df---37610734810.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rd433r0hg9j78mntcl08mhsbk5/femomatibebodimapej.pdfIn PDF document text
    • https://ka-base.no/images_content/file/wodiruzo.pdfIn PDF document text
    • http://svx.su/ffile/file/90686005587.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/99655936254.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/70158829691.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d0bd1231e---50858786606.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/lubosedajorozemu.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070120252573499.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/53a2afd2b42eb4093226d8e55a43fa73/sefuzudet.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16098551ecd693---63352635281.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/tujofafoxikifexinosi.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/banagudij.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210605051907.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/putufarimewibuseliv.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/3004377601.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e870517cfbd---fubowulev.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076b70b8feac---mavumadetinos.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_off0000bb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB44 11060 bytes
SHA-256: 54529549c3fe662e2cbbe82e03691a3beb3b4aff8fa9e17db58751649507f5f2
font_01_sfnt_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 15632 bytes
SHA-256: a4cce0cfccdeb65e42e40b98503875724372a65a12e942176f07f9276008ee4a
font_02_sfnt_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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