Malicious PDF — malware analysis report

Static analysis result for SHA-256 248089d47c9567c0…

MALICIOUS

PDF

95.7 KB Created: 2021-07-07 03:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20677afab09486b436d9c546a9594363 SHA-1: f111a1a045d4d7a0547269adf99036a0cb8b77d1 SHA-256: 248089d47c9567c0628497d0af84eca7f7073f050b35db6df2acfd05aa7c7687
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive use of external links points to a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=high+weightage+stocks+in+nifty
    • http://4seasonstours.in/userfiles/file/xosoroxivibosolawegu.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cc7680630c08afa4f5fc78667b44b7ea/46525464273.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/kilejutaxor.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/54347529020.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a7b61c97---lagixafozexonusukugala.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/61320180487.pdf
    • https://zemiigori.com/uploads/file/zuvexepitovagep.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f198193db9---43924875697.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608657911fddf---bozepati.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/5nrs91ju4j6r4k0otu0udti8gr/fukuxifigemalufuvekise.pdf
    • https://carcable-bg.com/uploads/pictures/files/tidurojibo.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4395ce8bfd---fukurubivolekusuguvagef.pdf
    • https://aquatrustfina.com/userfiles/file/duxuzufusorudosawu.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae3884b6f---38037454347.pdf
    • http://ellissi.org/userfiles/files/dogewoluxusufovipif.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/af88bee7c90f0db23fd12d9457b92033/76365398838.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a374da48f76---tabixivufeguwe.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9de84f23a---gemode.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5ff46d2f---karifevodov.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/7fe0fc59fe829ee897dea035fe044233/fejowibevejipis.pdf
    • http://stacjaregeneracja.pl/userfiles/file/29765725529.pdf
    • https://motelandratecuci.ro/userfiles/file/gusisusanegoj.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/61911c4ab907c6d2d884e22529e57bbc/68050209687.pdf
    • 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_off000111b1.bin
e4258472702c8f2616c319e52e9219dd942be3dc67f7baf92b31fac226694dfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 17996 bytes
font_01_sfnt_off00014103.bin
6e70abc90b6ff4ae2e97ddfab835562eadf9e51deb252a629745ff28460fa6b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14103 10752 bytes
font_02_sfnt_off000159cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x159CB 16792 bytes