Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccd5e026a4cc6ea…

MALICIOUS

PDF

86.0 KB Created: 2021-08-01 16:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4bc39302e093403e303b67f402f586d0 SHA-1: 5adf5562e2f0bf54c73903e75d38d7c82f2cf6a4 SHA-256: eccd5e026a4cc6ea1c9a7a276cb4e2369b6a20e56c1ce4d4d788550753501348
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains flagged as compromised or disposable, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the collection of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gyandeepjkss.org/userfiles/file/26854621397.pdf In PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210618135115.pdfIn PDF document text
    • http://camonetinternational.com/files/file/5007914440.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/57662340576.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/fanosuxijuz.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/subojumerumadoviwoganol.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/renofizasil.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/52457230144.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/jabig.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/55shhq7d1ogb47ml7sgedcb105/45125915664.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bd5f15d5a---79045400504.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/34175478994.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/73bb9e506f51f9d1b1406d73461932f7/69045631711.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021623112398453.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e7dbc160---rotusanirixasanuwazizaka.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/35551363277.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/tokofixejuvazakanolom.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/jejilup.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4e769af8b---87248742399.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090b65bd0dc4---xoragotoju.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc48e410425---javevo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cd018042a---wakezatixubimununavori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=foundations+of+finance+9th+edition+pdf+free+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_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 16692 bytes
SHA-256: 4321bd9d4d10e3a0f6657b650bfc52ca33d0688c006fd226ed6744f295b6ce9c
font_02_sfnt_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 11048 bytes
SHA-256: 3a0644a6c91f186bfc22b489b6d120371050cf1eff4d0f3f9108b3e336c7d4c3

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