Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc96c2e7eba7400…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 10:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a01aa377d59eaad060dcf888fc7be775 SHA-1: 16680757c2759a36f19f6902172fd7ac625971e4 SHA-256: acc96c2e7eba74000d10dda940a735265d119fbca5aac2a9cf0e20da4644e807
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories, suggesting an attempt to deliver a secondary payload or phish for credentials. The presence of a visual download button further supports a malicious intent to trick the user into downloading unwanted files. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=disney+hotstar+premium+mod+apk+download PDF link annotation
    • http://good163.cn/Uploadfiles/files/11928239089.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/xijugubikukepukarig.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/932017471.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/7389359962.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/88127740036.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/49118012854.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/13071076250.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613342af682ba---9398306575.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161368a5fb3036---ripelawi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614111ab5b82f---batidekafelefagolomok.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/wuxedemafogejul.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16312656551195.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210915_154555.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110364ece0---fosiwugowifesegad.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/zenoxatibomonizilul.pdfIn PDF document text
    • http://gewald.ru/content/Files/fatefewerupuraxegezot.pdfIn PDF document text
    • https://n-tlg.com/files/file/wulojanoxodifi.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614467145f2fe---95400824426.pdfIn PDF document text
    • http://vo23.ru/upload/file/mewilituto.pdfIn PDF document text
    • https://parc-hotel.info/file/80320702059.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/4207291831.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/sixofimaziresasolipuboguz.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/96884260163.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/rolunazawixawid.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/sumoduzujukiwaxapi.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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 17484 bytes
SHA-256: 4d5c2edd9f20f8e12ebb10f0f07926bbe0a3a7c31a085e19563131cbb4a22cec
font_01_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 11052 bytes
SHA-256: 8a5c0a0c6563fecbcef6e8db60b66f06323f8554cf9a14f37e8f57138ef678a6
font_02_sfnt_off000128e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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