Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0d2597bb87c745…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 03:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 68e68f1bab509c060d0799cd86f5175e SHA-1: 861f97360670c5e493c6cbc4784844befaa3915a SHA-256: 7d0d2597bb87c74532557824e2d48c04e4f4345bca8846d270a248faf5c498ab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of 'cmdkck/wilabomupozixikomoluxevob.pdf' in a URL suggests potential execution of commands or a malicious payload. The file's structure and extensive link farm behavior strongly suggest it is used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=precalculus+practice+test+with+answers PDF link annotation
    • http://bachova-terapia.sk/images/file/60132372549.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/39f9eb5ac8542420b4a85dc32ba92bbe/tetileteduvuzatemibejuxej.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/wagumuju.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/lilinurisor.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f40b5aceaa3---566459608.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/59269432033.pdfIn PDF document text
    • https://clubon.top/uploads/files/10882198718.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6qujoq9k606fg60j9tancmdkck/wilabomupozixikomoluxevob.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/3144613489.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/wujodonazupotizufobi.pdfIn macro / runtime command snippet
    • http://www.anjhimayath.com/upload/file/zolutojololudikejavoxez.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b78b7d61f4---92817502416.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f214df99b---fulusibejerazazoronubokuw.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607076cd7ef10---18160502788.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/kosozorogosabavebamapo.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/wukodudajizomagigomax.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/96829938208.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e7beb977095a00287ae8bce7a6f19a25/najegutidenewerezudid.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/topunomedonusoniwapomason.pdfIn PDF document text
    • http://licausi.it/userfiles/files/33551636364.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/75906782832.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/tuwafofufadub.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6f8210c2d34ff2c12ad93876eea533e4/28637688693.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d761604e6706a89a7a1d9c2dcf3f786e/54781850358.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab4b4b85a8---74709002522.pdfIn PDF document text
    • https://betalinktech.coIn 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_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 18544 bytes
SHA-256: 7fc94989c5d51dbbdec81d4fbd85a0f33eba3be7a275123b3aa84aa9cda705dd
font_02_sfnt_off00012634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 10540 bytes
SHA-256: ab83b329a121a1a6bb0e080637c6f33e7d401905ddb0ee4d16431da7fb144af3

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