Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58e044ca3ee2de5…

MALICIOUS

PDF

81.5 KB Created: 2021-08-21 01:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f521489fbd4e038f47aa2a52bb38f607 SHA-1: 2f9da7d9fafa9c2ebca92237ade560c35f331397 SHA-256: e58e044ca3ee2de556193c562bd097386869af9215451aca90b14fd812fa4332
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://popnmusic.fr/userfiles/file/88327699179.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6530eafbc---guvibu.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/gubin.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/9caf39b742cf739d2a9d2bef0b8a32ad/jobiguwozazepulebiwubi.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/84d80a6481230b7c98c7bbedf2184121/72345485200.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610e63d4dbfb7---48762006736.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/38703355921.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/17590670287.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/bfp1uik7cklhbr7i4nv8554emn/88100034188.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/53089617852.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610739d4b097b---21394134531.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1ec497c5---jumezuruma.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/wulotunatinukivimu.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/78393236085.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/muvajubu.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210727_66877B57129EED6E.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/50cbad4949993a8e6c2dcf9398ed0317/79380291035.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a351e0354fa---tukovane.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/25888024538.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/51191994009.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/42149171237.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/xikegixekugomajisek.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/jovat.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/a15nltgi27pe8lfhslt10ahpn8/2508406038.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/jikukemejazuzadetetesela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=five+nights+at+freddy%27s+sister+location+download+apkpurePDF link annotation
    • https://mediaget.com/userfiles/files/5073098680.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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 17456 bytes
SHA-256: 0839431721e625abae0bbe059b9a94506c3c69ecc60cd600ff59051d8348a1a4
font_02_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 11368 bytes
SHA-256: a9efcf702c13f80d4af811eb2c7048282c0e62f0cb72177fe83f73fe9b763c18

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