Malicious PDF — malware analysis report

Static analysis result for SHA-256 763046955a0ce320…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 16:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b1e070f6b63cade506a0a560a248e357 SHA-1: 208c0205b0a1043f5a87a35849bdb840e053fa89 SHA-256: 763046955a0ce3202b1122862c9845d5ca5e25f912d7a47e60727bee258145db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=how+to+download+games+in+play+store PDF link annotation
    • https://aedwea.com/upload/foto/buwizuwilenixunuxuwinu.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/pipamuxitafaforepefabik.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/24448270635.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109170302321413.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613033e6b3704---guwivomifevov.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/72114376909.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/29617432370.pdfIn PDF document text
    • https://istanajp2.com/contents/files/23055096918.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/bodewepirawis.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/vakezukiluxezugile.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431a188ea7f---61115590076.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/nufodukesorurokiwad.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/13/zimugapajaraf.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e5461e8c676f1596a5b4d746fc85cd5a/sisupivi.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/94811531121.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2842ec60db0c365bc3cab4afd76a7785/83895795122.pdfIn PDF document text
    • http://cocoal.com/uploads/file/23547591396.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/23388603552.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/dilobezodibulijebujin.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/33551809363.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/japukunobiziw.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/45466523049.pdfIn PDF document text
    • http://ipublicity.cz/data/file/japipojarodifazonusulon.pdfIn PDF document text
    • http://ranchobg.com/img/file/degujejenuxiguteruvuse.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_off0000cce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 10928 bytes
SHA-256: dcaa0fe7f644b6f2e39fc606d7281172e5794c4df762c1273cf8af52648f4524
font_01_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 17592 bytes
SHA-256: 493a1c72eca1f368a794eaec8e28e31774d8f50d106999cd17b6120a460d4731
font_02_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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