Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c48e65d9e12ac6e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 23:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6774f271c549fbb151abe2c4fee189d SHA-1: 64c81aba151abcc91ef5056b057a178b9381cb10 SHA-256: 0c48e65d9e12ac6e0d74345d5cf95c62be4bdfa7fad68f9cc0b0f1d5379f00f2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The presence of embedded JavaScript and a link farm pointing to compromised WordPress sites suggests the document is designed to lure users into clicking malicious links or downloading further payloads. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://orsam.org.tr/paketler/ckfinder/dosyalar/files/11267629801.pdf In PDF document text
    • http://alburigiott.it/userfiles/files/36589624783.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t71vphsmkk1gm0gj7r610a7jgq/putukoselajoputemag.pdfIn PDF document text
    • https://defi128.com/userfiles/files/gotixokipiv.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/mezufumogorimupotabowe.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f2623be9ea308ddc3d21994ce7f19375/binewoxenifomanemajop.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/95c1f0e205a85683e5b1cb48e517cef0/57125470185.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/60029974498.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/85767530230.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/bamegumopufekamukifusow.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132f9af959f1---50164729613.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/82525281061.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/newapaxej.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/91757039846.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/62599475735.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/sibukidukomabiriberumod.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/rubufi.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/fakabetonizawowetinalux.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/17610057863.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/18879023688.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/72234361335.pdfIn PDF document text
    • http://zae.me/datafiles/file/98723416098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mp3+video+converter+old+versionPDF 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_off0000ced5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 10576 bytes
SHA-256: e21da9811fc07924044bbd75b5315c68c2c055fc29f4ab60d7dd27e7f5d8ba38
font_02_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 16988 bytes
SHA-256: cba026d2f9e4b46bbb5b3d8faa43a77fd7b6b4bfd1a684ef987b9e4cb3cb8c59

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