Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6bf2e45ac1ce3e…

MALICIOUS

PDF

110.3 KB Created: 2021-07-17 12:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 889c6b5429aa4b64bfd370586f7f4b62 SHA-1: 0aacb7a7a546e94a0eee7428d30c1dac34b1cebc SHA-256: ff6bf2e45ac1ce3ec256ec46acb28471023b4ce286a3c821ec36f746f41c4876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://micsys.in/userfiles/file/8803282491.pdf In PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210514194958155.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/27799751190.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/96gk19id12t5jat5daikjj0cvv/64631346292.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/51963404624.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/39472538566.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/jarigajegupena.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607180dcc245f---xojakagelu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840ea3578d0---rarejafas.pdfIn PDF document text
    • http://blueyee.com/upload/file/181914503326.pdfIn PDF document text
    • http://ausafe.net/images/art/files/21907917871.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/83d975e6cd03b3716f3196eb00474b9f/nekesudexotubolejodowawu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0847982a31---nizoxuwoxawifulujadamawu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d34816f6---47340060872.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/24428515106.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3bc9ffe15df2e06a354d3fad51827a64/24580246624.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/82569ce2acb7eb815bd1ce712552264d/duzopesomaledobefinarun.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/topenek.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160868110d15e1---zoladaneva.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/17657581186.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cc213c8ec9b---44846046875.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/hs6n1k1mh6sa41elsj7bfkur6d/89571375778.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cedf27d9d---8448937218.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/0f8e6c538e1faad605b680975b4be40b/18343167332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=database+languages+in+dbms+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2157a06354430904b549214dfe42087d/66647228438.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_off00014aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEF 10860 bytes
SHA-256: ac9cca39ecce946f2f0d3e0243a824ebfeb25277e9b197da2d75ff538099e9c0
font_01_sfnt_off00016396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16396 18372 bytes
SHA-256: 29b6e56ac3aa58c2d73fc75f3e28036a2fefd757524b3c1689f269674815c2d6
font_02_sfnt_off000193a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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