Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8efb3c0ceee6630…

MALICIOUS

PDF

74.1 KB Created: 2021-07-07 11:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8948de6f3edf7089e66bfa1820ca3057 SHA-1: 7b1c78e3e788e6dcaa6907ecb7ba46f31e41b211 SHA-256: a8efb3c0ceee6630f553e56e34a6c981f2b99b8fdd59bb6d13fc7357d7efdea1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful sites.

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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b1f1993a18ce33c19ac12089c6e52853/pamajanus.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cc659a9d6---43060553351.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6c68181838da21d2590c579d32f4a807/mibakiri.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/80695105158.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/logefitezamupam.pdfIn PDF document text
    • https://paperland.bg/uploads/file/90935291562.pdfIn PDF document text
    • https://o-dance.com/upload/files/raderalutime.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/06f77956230690e80efe0bb23edc3e87/19361230836.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4faaab6a2---2375543512.pdfIn PDF document text
    • https://capecoralliving.com/media/file/wepimujiwesowaxivame.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/mebisinonosenevufaneze.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/61cdf284655f40b738260a24ca5867f0/46146570873.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaaa56571e---82467594621.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb0dd3f831---22380306987.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1625623140.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/72593cb509cde13e4df76492d677633b/wugakum.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1de2bb287a---vinewulop.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/92919083778.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/3h5p82ek6l857ijjgjtfcgjial/53563659943.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9832ee98cc---41035348616.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/48510083636.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/rakusolugadese.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/69475065132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pete+seeger+inch+by+inchPDF 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_off0000c0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D4 10436 bytes
SHA-256: f74011c3eeb7a23d76b9d2f417cf481b351c36335137cf693001e8afddec679c
font_01_sfnt_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 16360 bytes
SHA-256: 9fb942b46619e9387da1921d16c0b63ae6e9a9d05ffb0b9936c2cbbd6c1ef391
font_02_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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