Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c5c90b34bf2cc6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 17:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db592ed4a7ed74338e0a2fcc2a4f2e0b SHA-1: 7c104e3f4e7a09ee372b83e9b40bb13ce6d48cb2 SHA-256: e1c5c90b34bf2cc6cf396420c509308e5936cd5f85b1fb30752cf0975421a4d7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple unknown and potentially compromised URLs suggests a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://korzayithalat.com/spot/admin/fckeditor/userfiles/file/dojatazerinudanavixoboxa.pdf In PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/maruvoditagorof.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16142f2b0b9318---64360112474.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/81058970546.pdfIn PDF document text
    • https://tebra.si/userfiles/file/42266761023.pdfIn PDF document text
    • https://questyme.com/userfiles/file/fanepitek.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/tosukokopapipolobizoxi.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/86454156165.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130882d1ac21---wunagizakuk.pdfIn PDF document text
    • http://becucci.it/userfiles/files/15189295369.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-9/20210909131223136697.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tobopewusozekufunejiwo.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/34106989434.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/zerewukuzojenakedur.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/zadekorobojisusapudiw.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/winavevobinuma.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/59133033872.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/27273142286.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/devapakesu.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210921004946.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-03-23-24-30-36.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/pujipupoposozoz.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/8535853729.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/22e0fa619808ab09521984ba5862b205/75104678241.pdfIn PDF document text
    • http://kaies.net/upfiles/file/lupupizilo.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/46894132341.pdfIn PDF document text
    • http://cascad-trans.ru/files/rodidub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pubg+new+apk+updatePDF 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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 10460 bytes
SHA-256: c100c1cb1a9217179888c6845ebf8d8a5531a9bdb674f211876b6f5092956fc4
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 17460 bytes
SHA-256: ef4e0e83d61a1bd7fb2ebcfeb337d5c24062fde9e586ccbb5e4fb49990ad53c4
font_02_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1