Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fbe0cba60c1026…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 09:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e487110535119d655f0688e5adb5143 SHA-1: 9ba571da0a6fd7f195cd76ba0a9b745da29f0c19 SHA-256: a4fbe0cba60c1026cdcc72a857e9bd03e7d7d05e03205e747dafc797cc66fc6f
284 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or credential harvesting campaign. The document's content likely employs a fake CAPTCHA or MFA lure to deceive users into providing sensitive information or executing further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://medvor.ru/uplcv?utm_term=log+into+hotmail+account
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/9293345257.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tlj35dlpo1m4t3klpj4ho4npis/xetisepug.pdf
    • http://zhihepvb.com/upload/ckimg/files/202109092136033237.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/jerugojuniji.pdf
    • https://salondumariagededijon.com/userfiles/file/jizixokadexal.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/80703865804.pdf
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/xelupasegisijagamoduveme.pdf
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/43760057036.pdf
    • http://hawaiianhunareiki.it/file/jedakode.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413be571812---zewowodufaxozixuri.pdf
    • https://radmangroup-ye.com/rgfiles/file/mumokeludel.pdf
    • https://okinawa4d.com/contents/files/1773848797.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/kinaxuvu.pdf
    • https://totounited.com/contents/files/rufokazezud.pdf
    • http://fishtech.org/uploads/userfiles/file/file/somipenenaboxin.pdf
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/gonidijol.pdf
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/bozofuniwarinogeja.pdf
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/pititiwomawisojitaser.pdf
    • http://m2m2design.com/userfiles/50264638054.pdf
    • http://www.asiacoservice.com/file/files/89012228982.pdf
    • http://sciattella.net/images/file/67176028877.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405dac3d873---61282807226.pdf
    • http://quaisetoiles.fr/img_pages/file/64021963980.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/96794951214.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142489a38112---jijamovokidolarudolujen.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb7.bin
796392084d2f7635adbc3cdbc56a18695556425f88baca5baca9df8c17bb05f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 19132 bytes
font_01_sfnt_off00010f29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 16792 bytes
font_02_sfnt_off00012740.bin
096c5910cfd68dfce2c2f5554bc4efe3f3746536f923dad8ac53d451fd1ff2db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 10336 bytes

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