Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4490e58e8bfebc6…

MALICIOUS

PDF

121.0 KB Created: 2021-07-01 19:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 77d1f2e456bd83452612f6fbfbaeb0c8 SHA-1: 2512fa1bc04034739720b7a0cdfef241c6fc2de1 SHA-256: b4490e58e8bfebc698c716a108cfaf5f035ccb1255173c7837bb4b72ba42460e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload directories. These links likely serve as a lure to download further malicious content or to phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b510f5db2cd---53822386471.pdf In PDF document text
    • https://aimhc.com/userfiles/file/74325367564.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/zupen.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fngtkc47ahbig2tnm8gk2grl9s/xavodasufubemimafa.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098326f75fe3---48061488205.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a9fdd40567d5705505776b80c89a7842/zeravutomej.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160961ef4519b3---fanovaxenukepolel.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7ca0110e---11857636912.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae362c5f88---65904184578.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e01acbb73b---beriva.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/50469c3246cb672189c4ae54b9ede1d5/11475343473.pdfIn PDF document text
    • http://raczcsalad.hu/files/mamexo.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/kexosanejedejojodaxojiro.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a7da1a22432---19068056858.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/98c9084179ee90b9addcc547baaed205/74808713300.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c9e0cab77---78723866037.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/manup.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ee30a1b7baf00d3a5c66e4897a607dca/fisinepel.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8a1e2c151---fanabevik.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/75906546403.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/73740442870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=metal+carbonyls+structure+and+bonding+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14746 24932 bytes
SHA-256: 4bd43529f9d53d7d0e550a2807d936abbad4d77203b68cf862496b21e7bc7f79
font_02_sfnt_off00018ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE2 17940 bytes
SHA-256: 711924ac50bcb5edad92ebc77680b11ac5af78e7cfb5c7bbe7cb2988fda998d7
font_03_sfnt_off0001bc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC18 11144 bytes
SHA-256: 9e30d8ee5371ebafdbe4a2063f7ec807e96b099d8d14c27b78562ed7808ea9e2

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