Malicious PDF — malware analysis report

Static analysis result for SHA-256 7031804ea6dfdf5a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 16:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c56d6d1d0acc09458dfb334feebd0c4b SHA-1: ab0d5bf44b101dd415ad822293c7362c47d2b4d7 SHA-256: 7031804ea6dfdf5a35e1db7e2d83fa1ef443e3a691341e3ced0857ca867c7140
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host a large number of links on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.verneteco.com/ckfinder/userfiles/files/83154289467.pdf In PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/78522287186.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/62755707986.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/46905185104.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ee5be65c833f3c19fdae52cec9c1dc13/tunabadedajapo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161318d63822b1---94788625613.pdfIn PDF document text
    • https://cargotavio.ru/files/file/sodujonigoni.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/57098301078.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/dilapubufinimugukevej.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210910_091011.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/nepixutixidetuwax.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/majed.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/63453005837.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/vigilokoxejum.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/51597145397.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/94818345852.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kubijifo.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/rokugun.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16132bd565177a---kojezopipewufuratev.pdfIn PDF document text
    • http://pololanna.com/user_img/files/punetadosadoja.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/jafitujuxisuxukok.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210904141754.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161308d64b6d6e---dijapid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=speed+dns+changerPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 17588 bytes
SHA-256: 15526ffbe9c03034b1469d1f45b7aa1f7c2e1decde4050db0ee6586962ebd807
font_01_sfnt_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12784 10512 bytes
SHA-256: 128b36200fa19f9640a71ea482518ff3202558b68b34fbf2e6ee8758f2ab1b1a

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