Malicious PDF — malware analysis report

Static analysis result for SHA-256 256d9487890fad8b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 09:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c491d70e530d28f0a9fa86b154b00443 SHA-1: fdddb2f6f31e8f5a09d697f159a67840a7d78452 SHA-256: 256d9487890fad8b851cac34d4a2f0a3eff933ab5dd3e43f38538495bfbea692
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada83f82f38---bopukexipopinefuvoledon.pdf, are key indicators of the attack's infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kurier48.pl/files/userfiles/file/65251259862.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bm8oc27b6g0d0mm9eq1ae11f16/xumekemozafuvepiwe.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ac95ca9c2ecfd21664495033ac6b0e0e/dinemigofopuwazalenime.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d0e878a887f67550975ee45120de8f8e/bemifuzejonetegevifobi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a880620d469---dixizejigejejanux.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/69108614427.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d8c20fd4b---48934024878.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/20762571647.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/feziwol.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/61180294135.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/sefoba.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada83f82f38---bopukexipopinefuvoledon.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/sotumufusamavenarovoxo.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9e6vbafko0b4da577fegvdko2u/widaxomaf.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/90887484397.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m64p2tijjmvj67hkdr8iucfhh6/3141175502.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160749dca7dd4d---49538761524.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/livazeguxev.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919736698a9---4439509700.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/3d61aeceebc2b1ee33f4a38845be72a0/78656296774.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161216e4770112---98635664720.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210627_AF264FE6C5D8DF86.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=puzzolana+cone+crusher+manualPDF 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_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 16964 bytes
SHA-256: 0c6c38818fd9a376ddfaedf306dceccd45f1751e078169e390cd4c154ccf61e7
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 10464 bytes
SHA-256: f99a9ca9e1b74f765d96415575f3f2b62c4fd34d3e51de1082c908f529f14391
font_02_sfnt_off0001175b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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