Malicious PDF — malware analysis report

Static analysis result for SHA-256 894b586f8dc98be8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 20:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13c21558fa9b289dc037ca4199172a4b SHA-1: 77d0758c2eea76694c0ff585b264e37d0015aec4 SHA-256: 894b586f8dc98be8ec802acfa1179580cc0df5206a3a8864b83eba6943f0ad62
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution tactics. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=definition+of+reading+comprehension+book+pdf PDF link annotation
    • https://aquafilling.com/userfiles/file/bomovumofepine.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/wupepetonisemilevujozeg.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210822_101811.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210820_CB239B8C7822C80F.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/27093233982.pdfIn PDF document text
    • https://nicosiacaffe.it/file/74596577892.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/79288004997.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/nilanemedosujuweg.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/79409019164.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/wefesuwibeda.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/vujidujesezorinivizogoz.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/zofaluluvegunijarabuf.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160821beed5f68---38786997790.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/megite.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/77674678639.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/fivajeze.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108c7f314757---36792780400.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a95cc8d786---jukope.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/23617599107.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609a03d474e76---8762629688.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608496f5e9b90---vuxus.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/edb57f18922495caa34d72b9b3ae1852/77447326434.pdfIn PDF document text
    • http://nfc.soo.jp/file/15787507737.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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 17748 bytes
SHA-256: fea3d930239947ee952edb059503fda9836c77d6438667450c6ea31c183ecaa4
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 11256 bytes
SHA-256: f3f5901b2c297383d3f5ffad63f9162e3ae1c8f6e5033252ab311fc5fb60e153
font_02_sfnt_off000122b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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