Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb5c7bf252bbc7f…

MALICIOUS

PDF

73.4 KB Created: 2021-09-28 04:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 942362c6dd7e23d6c5ce6d0407df6653 SHA-1: b63d8914d9f88e25083084977111959ca93063b3 SHA-256: fdb5c7bf252bbc7fde9b878fbccc1508e18a6b5703b38ccf8db3094bf71f9d90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URI heuristics and the overall structure indicate a deliberate attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=how+to+install+genymotion+on+linux PDF link annotation
    • https://e-uchebnici.com/img/file/deveneralipotoxekukat.pdfIn PDF document text
    • http://vina2002.com/uploads/files/27743558054.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a4efbe793673b592d63119e8c7bfc021/51024796820.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144940229d06---90331911910.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210923035942097501ggnsu7.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/lipigutubefulitijelizote.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/23027941987.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/29308062133.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e443cd893dbac6045d002bc0e51d5800/sulidevuxofexegina.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/xumozaruwikevobakuw.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/27182635501.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/45356637881.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/zirapirusu.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/savuzofexonopebelexu.pdfIn PDF document text
    • https://oktatas-konyveles.hu/term_extr/files/76977225514.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/72015083034.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210904205409.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/18262475701.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/70345857045.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/texuwenag.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/womeluwerudebukapizup.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/zadisonadawi.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/mobekekuvenapetewiliz.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16151bff04bd55---27825588965.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/74698148081.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_off0000b70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 10744 bytes
SHA-256: 17fecf69b1a0d75b99fd1e5038096ef56d33ef508ed90338fbaccfe897637b72
font_02_sfnt_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 18668 bytes
SHA-256: 6e26b1b83b1aa20d5c9f3427a3860535d542b7a7a3c43df03de50fb3f371e046

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