Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc79ed554106184…

MALICIOUS

PDF

88.8 KB Created: 2021-07-02 08:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e55369d095086bcc4dd13b877dfe51d1 SHA-1: 41a6e557a253d0c13411059bb6cc34450d43cb40 SHA-256: 7bc79ed5541061840ed6540082114b0ceb3568ff541b0ec30392f8bbaed4d8ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL targets are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c26dec0f12edfdd4f1a35ee4e5d7d1b5/98329573180.pdf In PDF document text
    • https://italvaping.com/file/36811432942.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/fa039799d801c1150493c2b151cb1b42/72611319003.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9gf5hmlp47cgsm3pg5g249cv3c/bojivorage.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec6e4a163b---madogosidugeves.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/fubojiz.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f1e7d587788dafee969ad5ee078b0dc7/vesosaxubodukegifilezuku.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d6f4f3631---nuxerol.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aaef02484d6---18893045628.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/panotarorovimofo.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/dovejatetaru.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a58cfe3546d---zujevej.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///95384972118.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f084da7b4---xinuzuzi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/efd351d6137c4f7d3f58e35e81cef8ba/68823582839.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/14031554416.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210623034520_l23f31.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/71234408327.pdfIn PDF document text
    • http://hibertek.com/image/files/20210610_113637.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a622866408d---jitefu.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/ronov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+draw+pie+chart+in+percentagePDF 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_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 17340 bytes
SHA-256: f1e43b5aded318a8c3a76b4c7ac2f0934a82bfe3b167632359496b304e500e54
font_01_sfnt_off00012621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E38 10656 bytes
SHA-256: 077ddb419c239330621f1fa07f9ef5fd57214c4957649d669ff89bff2db5abde

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