Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d2736d00560ee7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 22:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd7b7689520e7d5ebef5eced26303ecc SHA-1: 5fe2baccf0757e3967f1b112e8d198807a99c6da SHA-256: c6d2736d00560ee7ffa2f9158d7dcdf6ebf7e039329706934a0ed61286210b56
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised WordPress sites and other disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of invoice and download button lures further supports the phishing and malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096385fe45cd---24248907070.pdf In PDF document text
    • http://eko-inwest.eu/upload/file/jizeru.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/97144910452.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/72548378951.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/wosutujafob.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a84d9d7ae02a0a952fdf42cd15f43026/91680550957.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160871a3da3ce4---dudoluzafujizagabaroborix.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/68275216124.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/49e559be7abf5e27145c4341a199f912/luloz.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/p7ona4eklg6r7qbsbretrceojb/lidewaxetazoxe.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/gokisi.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/84843902165.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mfb9foots5mad1t7guo08v7478/zasowomobitebakujuliw.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/begowamatol.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zopemiwopepifij.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/28916456808.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8ae450fcf7e26a7570a72c1f27f2dc46/lakunijitiwezizokenenoje.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71c971103---16395176866.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/japoxer.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/movedepalamojuvuj.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/tikixoxepojirutuxid.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85303e5319---85789445415.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/44543520381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dashboard+in+excel+2013+tutorial+pdfPDF 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_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 11528 bytes
SHA-256: 89b32c050da2272d2eb45224e96d6031a89109575fe9b5b2104eae5a1bdc1253
font_01_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 17600 bytes
SHA-256: c585b5ba1de35d39d4107ba4deea7ef313b743039bc9078518dc8a144a84cd14
font_02_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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