Malicious PDF — malware analysis report

Static analysis result for SHA-256 02456eef5ad2312c…

MALICIOUS

PDF

91.5 KB Created: 2021-09-07 07:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f182ebc7e729dca1921793b2b213dfe2 SHA-1: c7ed7267f44392ff4f7ed6ee95f00bca99ac6892 SHA-256: 02456eef5ad2312c27c2b136644bae590ba77bb541ce3f615da78cb8ea65d54a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the link farm nature. The primary attack pattern is likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://guojingmall.com/userfiles/file///nipoxawoveluwegivexusi.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160799f8a825ec---sutobopisasiwibabileras.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/korewajizepuzu.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/gofewivezinitemikaji.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a59153bc5---87440787413.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/44710826291.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/43090607887.pdfIn PDF document text
    • https://media-get.com/userfiles/files/34433948577.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/lewulu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bec6b8e182e---nifutoru.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b41e7b3713---96446319004.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e969b0033---83542493513.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/17525086394.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f98fdab4f0aee248b6cc69bc65e1622a/64931494427.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609901e7d92bc---sodemevobuvog.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/fexulapemiwajojekukelep.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ca73c1a3ae00a33247ba0c1b5740f34c/pasojemi.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfb5e2816---41283862039.pdfIn PDF document text
    • http://thedreams.cz/files/judegijejevizege.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/rizumobaniwukobofat.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfd0a7f13---zirazomubirikevefe.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/003togi9unf3klq3kddvdnj6m0/nuwakafiwepiwawer.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/vaxirusazulopilofodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ahoyador+manual+bellotaPDF 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_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 10588 bytes
SHA-256: 08d472b0a83f6d24f1398599152f1e7432232079d4869ad4a5f247cb367dcf54
font_01_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 18980 bytes
SHA-256: 4137f27fb84a1c64934df36a1dc87c9bd17800ab778036108fc751e2a358dcaf
font_02_sfnt_off00014871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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