Malicious PDF — malware analysis report

Static analysis result for SHA-256 b131540e975843f1…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 10:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 009da9d7046e5503d9e5fdef97dbd1ef SHA-1: 45063ea4b095faacab47c96e0f7dabefc958f3d8 SHA-256: b131540e975843f17975f21d12eba440e034641eae16eeaae32d0b5589e81dfb
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=mathematics+questions+and+answers+pdf+grade+6 PDF link annotation
    • https://fablab808.com/nbloom/fckuploads/file/danoguradafokilame.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///waxugatogopu.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/32121812914.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/fagofud.pdfIn PDF document text
    • http://ahchala.com/img/file/bobuvetegimuwazotage.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/3ef4be9cd8c85eb8ebc59b7795e039aa/fugut.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/61072744806.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/57491753254.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/feninuzowunireb.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/nakiworej.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0effee436---87182959046.pdfIn PDF document text
    • http://intergeored.com/upload/File/fepamawidakafen.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/kojer.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d6d7e4d8d94ad75db4009f6182cc8c79/rusuposawedexeke.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/wazalemenuvewopizozomazug.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/49102244354.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/xefifut.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210817112837.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f793295ad7a---24975007985.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5523a6928---dugapavaxejo.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608752ae97de8---93095562116.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/28441199033.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/merinim.pdfIn PDF document text
    • https://badoza.net/userfiles/file/xupavaferifazazelalikumij.pdfIn PDF document text
    • 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_off0000d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 17736 bytes
SHA-256: 7d049907b74a33958da5e80950c581efc69b84329e600b4189105c31342e343e
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 11516 bytes
SHA-256: e6dde9459ffdece4ad433b91df1357a295416429c9e01710cf10d73aa9e607f3

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