Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db9192be92f7e22…

MALICIOUS

PDF

95.1 KB Created: 2021-09-04 01:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 3ff395939842a05942604c9e986fc203 SHA-1: f3eaf7c1dc020afd9acd782621cd3a45dfd77d02 SHA-256: 5db9192be92f7e227d35f71a3a3329640115d3728d0e2db1c84d3e70aacccef1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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
  • 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.
  • 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://archism.ru/uplcv?utm_term=fractionation+action+checklist+pdf+download PDF link annotation
    • http://booklandbooks.com/userfiles/file/36711080361.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zosunaropolavokiwuxiwa.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/suvanixejen.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/87281897522.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jts3usth8i604j3ehuefrb3nui/45985820266.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/75339997931.pdfIn PDF document text
    • http://polletnv.be/uploads/files/99969157981.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3dd292b706d3a913de1ef4a5ae544bc2/nesepopimawojemajogin.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/virawiwumazarijireragib.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/75822285843.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fojinegedijarepu.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/86406133772.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/wabozibezofozukugevox.pdfIn PDF document text
    • http://askort.pl/Upload/file/wapov.pdfIn PDF document text
    • http://terrietanaka.com/library/files/33597567473.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/vubido.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/rulaxejefefesijitizafa.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210828_FBE2203D84C2222B.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734bda6b8bb---pokosojawulojasasaneririv.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/zutifulodun.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/33802899927.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/dajigoful.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0999782e455d6b63837c0d947f04f06b/zekezatumi.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_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 19356 bytes
SHA-256: 2dddfc19e543a98e48de7da9d1fd9883ed7ad1739336b58383743328165af702
font_01_sfnt_off00013d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7B 10872 bytes
SHA-256: 32db305e51eaba20597c32eca1f7c323f5bcec32f90522ecd9cfc8f38fef0148
font_02_sfnt_off00015697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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