Malicious PDF — malware analysis report

Static analysis result for SHA-256 d393c96b38ba84e8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 18:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31d92f6d4c6524d76bdc86e2f4e838e8 SHA-1: e97056c00780c5a44f00a2bded2153ad5ee201d2 SHA-256: d393c96b38ba84e8d1da3e3c1704dd3313e1b2b6ac7873ccfec12bbb264d8868
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDFs. This structure suggests a multi-stage attack where the initial PDF serves as a lure to lead users to malicious content hosted on other domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc08199c7c---47904403064.pdf In PDF document text
    • http://rts-3.ru/upload/files/34257487242.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb050a37a68---88003835474.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/36940610826.pdfIn PDF document text
    • http://epicridesnepal.com/files/28241615101.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/kopafuletidineg.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa168c74e11---garosowogexujite.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/752d6d2c8e8d92af4d3778a7809525d1/88661768550.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/eusi5p5ms1d3kpif3uptskp41k/mulojitumutezoxuxipasar.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/eed43ed7f109f8aa1ae37389a7be32fd/21190690548.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/74043038157.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/jifimeb.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dd618635---84375517534.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612d3eaf2dd26---89268592307.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/4484922611.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b583b67b45f---kepodi.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/16512838331.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/xesewokimineranebadene.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms//images/file/71088798574.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/42088733961.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608019f0e2708---rilafupen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=maths+worksheets+for+class+1+icsePDF 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_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 17652 bytes
SHA-256: 065d45d9641c5de2ccb18a8d1baa38305eb6a7575945bd1443da89bbb3f0073c
font_02_sfnt_off000123fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 10552 bytes
SHA-256: 231c93f6392e6cd45ed20d112ed33be85718219c9db5b232dae5c2f15e68863e

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