Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c76b15bc0491af4…

MALICIOUS

PDF

129.4 KB Created: 2021-08-02 07:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 063187bd5938b85db10956d766064c09 SHA-1: b23a934a5889e267f876ce170c8dd15e38e979f0 SHA-256: 0c76b15bc0491af4a9efb7252d8aa4e3d6f2ba431d14b8a5f0ad7de4e20df023
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • 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.
  • 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://beastyenergy.com/userfiles/file/mimelalurenubogunoxak.pdf In PDF document text
    • https://arichaindia.com/userfiles/file/65330669775.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/tawikabobus.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f0b3e0dd3---kezedebotitiveselowinomov.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37884e3c1---xodutozegewi.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/togujajiram.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b96e1c541c69ec302047cbd3fc66859a/91358267900.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/21469789712.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc990238a---webavopuf.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d326a409ad244835862476115bcd3681/veboxosofijoj.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/4b550ff493b5fb9e3013afe09dfca30c/kupurafoxugoja.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/e4i38fdr1oquuov042s9hejm72/wesod.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gaxogotodalekujofoxulideg.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/60920983267.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768a1e65503---rafojixe.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/36989647371.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f0be6f90316c52c357aa80a06695a58b/bunikowaji.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/52923794257.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/46274180774.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07bb793c2---64475595872.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/46016002799.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/jelujivajomimisegexazame.pdfIn PDF document text
    • http://eko-uklid.com/files/file/zitukukoneguvonefedubi.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/27829860654.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/37bbbc7d9ba5108989d20732dafb5807/95298214388.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/bofokojoxiwukufite.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/15100243130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=c%C3%B3digos+control+universal+rca+rcr504brPDF 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_off00018f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F3D 11356 bytes
SHA-256: fa08de2260471d03442942d2968fe634b7c61482d16252aa0872bcbefa85bdc8
font_01_sfnt_off0001a9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9BD 21204 bytes
SHA-256: 08e534c39382b5b7def3fc40b31ed2c8bcb2f994e934135b791d4cd2590d2ec0
font_02_sfnt_off0001dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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