Malicious PDF — malware analysis report

Static analysis result for SHA-256 debbb5fb33d567f8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 02:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43822f95613c2261108d7cbaabe349cc SHA-1: 0bf416bdbca2a1a1135346b7795a42e04e9cdc61 SHA-256: debbb5fb33d567f89392d0eb4e70e8281955e65a70722ea62e6a3fc57f4aa958
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised or disposable domains. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain sequences that could be interpreted as commands, further indicating malicious intent. The primary goal appears to be redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=3rd+party+launcher+android+11 PDF link annotation
    • https://vildmarksjagt.dk/userfiles/file/kujutediruxuxagemopa.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/bakifovevumolakupibi.pdfIn PDF document text
    • https://insp.biz/img/file/gizoxa.pdfIn PDF document text
    • http://armanetti.com/images/22484774369.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/06447bdef4d3a39eee8ab8693ce7e40f/33007276641.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/39452302147.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/12995364329.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/bepipowigeragivi.pdfIn PDF document text
    • http://93564497.com/userfiles/18335269578.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163079002832564732609.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/nuxoguboveni.pdfIn PDF document text
    • http://wwsm-us.com/files/file/4654473686.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/27825974895.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/dedilujorewipiriwosako.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/sufam.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328234c6593---1166660485.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/wumivo.pdfIn macro / runtime command snippet
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133946c55d92---fulowumipilupem.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/fatuxagifilenajivozonanen.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/98171996293.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/bawijiji.pdfIn PDF document text
    • https://upaspor.com/resimler/files/30606280740.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f86408fb4---xozaparikini.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/widex.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ee133b900e4386e0e978b46a33583812/66223552830.pdfIn PDF document text
    • https://ncfouting.com/wp-contIn 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_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 10784 bytes
SHA-256: e0509f4965b641cffa0f2771c30db9f217f7adbb9cb2ffe796086f1e4fabca95
font_02_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 17740 bytes
SHA-256: 05449edd239e7f10301271a6adfe038d217c0a8f857470f41e67feda87a67e8a

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