Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6bc04cf9231331…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 01:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2f9412c03db2a640bed1c9d1e0a752d3 SHA-1: fbac3ff3b3decfb6d251ec8c7755be58e177c539 SHA-256: 4d6bc04cf92313315b0591919a6c51d84d17bfd5f8279aca91a5679fd378a461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and other PDF files, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hkparkkonutlari.com/image/files/disepogutemamegizugukifij.pdf In PDF document text
    • http://nakloboucku.cz/uploaded/file/repof.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416455e070a---38177973406.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/takalimititexuven.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0a4bdf38e362bab44e3fdd457a6e98c5/jexanizularakerubosovif.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1c0e60c49f2d53856f4b6f28460827a0/35652273248.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406b6172315---74332557617.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/kirowefuzutedivu.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/49101758987.pdfIn PDF document text
    • http://idroter.org/userfiles/files/90971013510.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/rowixuzubojat.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/34516175307.pdfIn PDF document text
    • http://bushurov.ru/images/files/kisebivoxox.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5151d01fd---83503884756.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210911220450.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/56562289987.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/8471204741.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/jukolaru.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142030616e8f---53224755129.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/23634073875.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/xakazariluka.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/mixelupi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ed781bcf---zaxonevul.pdfIn PDF document text
    • http://hidramaco.com/files/files/84061452432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=snapseed+effect+downloadPDF 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_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 18056 bytes
SHA-256: abb417986025c8c08e0e75bec61ab9bfe7efab667bb2285380f128d2e1a21b4b
font_01_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12762 10580 bytes
SHA-256: ea7fea2435119b0a59ac44e0dc40a12c87f8782fc15772c27694b7c01a600515

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