Malicious PDF — malware analysis report

Static analysis result for SHA-256 756e59d35343bc22…

MALICIOUS

PDF

77.9 KB Created: 2021-09-26 07:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b363e822e7bc1a47e000c0a0500a2b50 SHA-1: 6ffc143388cf6cd85ad807bbdaabdd54db47e55c SHA-256: 756e59d35343bc22dfdc47ddf4eeaf296b578607b3d897a3891e80fa40a697a7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests a link farm attack pattern designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391adcdc662---rimun.pdf In PDF document text
    • http://batiment-tunisie.com/userfiles/file/38019338351.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/69921725419.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/rolazomefizakajov.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/11786133805.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/sokepivoramo.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/befesewiwedofegutav.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/bivulinelofusanopokiriwad.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e954b298d7---zaxoxafuliruloxopavelejoj.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/buveni.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/58662235670.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b87f5bd811---47121379471.pdfIn PDF document text
    • http://smileorganic.net/smileorgfarm/filesupload/File/tidaz.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/19672177071.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/18444134054.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/57833516463.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/xomulisi.pdfIn PDF document text
    • https://lordoptika.hu/files/files/loritevorofafuwo.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210925180319.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/25260236445.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/nosazuxoniv.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/10295867502.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210919124327.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/55227664694.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/fewizasozinuvujelogok.pdfIn PDF document text
    • http://gptools.net/userfiles/file/lawinomizerenaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=kindle+pdf+supportPDF 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_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 19944 bytes
SHA-256: eae53ef59354a58be13c73c825510900156c27dd55cbafd6b6920fc50e47dc92
font_01_sfnt_off0000fa33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 10420 bytes
SHA-256: 655258bb6d43c8658884abeec81caabc75e1198762279503120456811ac32a1f
font_02_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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