Malicious PDF — malware analysis report

Static analysis result for SHA-256 e959ee57de1b5fef…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 22:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f557136b364cd23ec49e369dc24d44f6 SHA-1: 6d0872db712ec7a0310425e2cbed364e78268128 SHA-256: e959ee57de1b5fef1cccd87005fa070d8dc97ff4f5dc479eec3a49579893b72e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Heuristics indicate it is a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://creativitagh.com/pevron/www/img/file/45102915790.pdf
    • http://bargiel.com.pl/ckfinder/userfiles/files/45871177780.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a421e0e1c3c7e27663ed7fde5683d6ee/zamumawebumut.pdf
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/7944882164.pdf
    • http://kukubara.com/zdjecia/file/rawewuxunomanuwexegob.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138a0c97b6ff---mapofo.pdf
    • http://ashioke.com/images/library/File/muzebax.pdf
    • https://advance-pack.com/editor_upload/file/78124063829.pdf
    • http://usa-ex.com/images/blog/file/xedoxuremekulepalas.pdf
    • http://irs-messtechnik.at/upload/gevim.pdf
    • http://0-50.ru/userfiles/file/45899656461.pdf
    • http://centrlita.ru/archive/image/file/sabojoloborujupuki.pdf
    • https://thefencedocumentary.com/adminfiles/file/84159604568.pdf
    • http://due.pt/js/ckfinder/userfiles/files/57343106675.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d20d018cae---bifigigizolegobik.pdf
    • http://indianspringhomes.com/userfiles/files/tukivarine.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/jj7nvfrb6sqaqp6jtsnb76srg7/41855139665.pdf
    • http://happysmilecard.com/uploads/files/7169935979.pdf
    • http://hongsung114.com/files/fckeditor/file/xetepo.pdf
    • https://osikovo.eu/webroot/img/content/files/bavepum.pdf
    • http://france-ex.com/images/blog/file/23440669339.pdf
    • http://a-pluset.com/userfiles/5674595472.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337b21c1b87---lunixowataxusugo.pdf
    • https://k85shj16h-561lt.com/contents/files/66396993622.pdf
    • https://etravelbox.com/scgtest/team-explore/uploads/files/64221250219.pdf
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/11545018642.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=file+safe+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf4.bin
16aa86607757a63ab636f247bbb3496fe81b0638892ea6b1117944dbfd64a254
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 17476 bytes
font_01_sfnt_off000107ec.bin
759cf6b382cd6443345e343eecb1f2e52aea0dd1b4824e5217c47c1099465414
pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 10224 bytes
font_02_sfnt_off00011ee8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 16792 bytes