Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21f560ef83860b4…

MALICIOUS

PDF

102.6 KB Created: 2021-07-17 12:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af8991c3f945cf295a28ff4e8acdead5 SHA-1: 14162fa1a3372254628d20c4796a958f33057bb4 SHA-256: e21f560ef83860b42989af31ba44904b7a60289e4be10ac96b9916141ecaac1b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm with numerous URLs pointing to compromised CMS uploads, suggesting it's used to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.anieliasfx.com/uploads/textareas/file/pejusaruzewet.pdf In PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/goxavobi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaad634544---88845356056.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc384a8718---49521524716.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c836b1b41---vilimazuguzarogivomovu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e817e77c022789ad0383cd96bd486f65/46711513944.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b43ab795c---3032622388.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zotadusix.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090266b3a735---57201199130.pdfIn PDF document text
    • http://yilip.net/userData/board/file/sanikezewiwufa.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/bowibazazujilegudo.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/gapafifu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eb4d355a0---2622463906.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/muxugukilufabab.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/359d35a55f8b140d87bc8bd276d5eae7/waxirude.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf33ebd26---97832601953.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/80101255851.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4e989461---tamesato.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/o0qur430nnv6ucubnvbvnmutt2/27636435744.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/sewejevaruvave.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/7ru4nmff12fkuopisk0r9podr1/12894568564.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/sunawa.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/dufogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=business+expense+sheet+excelPDF link annotation
    • 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_off0001300c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300C 17452 bytes
SHA-256: 4cd434eb45245c59370088b5adc9e9cdcb40c48204e1b6be07c39f69c457c810
font_01_sfnt_off00015dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D2 10344 bytes
SHA-256: 10ec5a6e2c4687cd9999647c73dff280506eab8ee7cb6ab1e418e9fe60d37dfd

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