Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadbb06e3bbb0325…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 05:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 542de8a38de96302b299c2114f4aa49d SHA-1: 2990a472493c95c9fa9ae283668835e3b7be481a SHA-256: cadbb06e3bbb03258a45e1610c735341d4214299ca4f2344d24bf1fd1801b292
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command-like sequences within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=pdf+agama+islam+kelas+12+k13 PDF link annotation
    • https://dubaimotorcycletours.com/uploaded_images/files/pijojusewasug.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/n64k64sjouklg73inel9kbi45r/82559180681.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11b1a06d1---30151521807.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/nedominom.pdfIn PDF document text
    • https://mollis.rs/files/xazidiwezimapakufu.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/fjr5kui7jkdp7agadigep9c4t3/sedanasafepubis.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e10942ea---41876703279.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/39551643893.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gilapujiwonedi.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/5c74a51c4770f4787cd5d0b431e07835/12653425281.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124ed870dce5---nezeruxuxer.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/jigibubokesexuk.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/tobamirosibotexoxif.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/bifazowato.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210902103304.pdfIn PDF document text
    • http://emaaravm.net/upload/files/lotumexawelobuz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d132745999---64552610773.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98be508f6e---daburimurekoguxenarile.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/30048350254.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/b1e6qrehnunn8k6gsbt0h6qca1/bowinesuzabe.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/nugajuse.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/luwokerafuta.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607715aa17ba9---vizegatekar.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210906_4B464C20DDF36F46.pdfIn PDF document text
    • https://accesoriosalmayIn macro / runtime command snippet
    • 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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 19212 bytes
SHA-256: 785ce49d689365b4f333c2d8f4247abc6d3ad59ef258aba2924e09963011674e
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 10712 bytes
SHA-256: 15deaf66a887473a2b922da7743fa51ddd17c63c8004967804deac34d0bb0643
font_02_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1