Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e7c3fd0cae8dbc…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 06:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3bfc17a2272607c4dd307e27534e335 SHA-1: 4b14d8e589dd68fdd4184e5a603b3b37ed92fe34 SHA-256: 19e7c3fd0cae8dbc4217d57d188942ecbf649bf868cf91da3290652c62dfd72f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDF files, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to serve as a downloader or redirect to a phishing page. The presence of embedded JS points to T1059.007, and the overall nature suggests it was delivered as an attachment, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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.
  • 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://www.lipca.com/ckfinder/userfiles/files/62059818788.pdf In PDF document text
    • https://etevent.itweald.com/uploads/files/6142ed23e0af6.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/wujaxivozafokobede.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/25402595856.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/puzepefuvaluruj.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/niberekorezanaf.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210916185804.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/11035841984.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/72193740121.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/wakulubitolapat.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339c86eb42d---wizikilabuk.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/woranewazufofozopibugefa.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452aeaecc5d---gegubevofebi.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/94499311150.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/79328429793.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161382a1bd97b7---tikokujipuwapen.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/gepimixumuwenapu.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/pejurotoso.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/63317404138.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/53700809690.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/56833235612.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210915_213544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+ballad+of+gay+tony+cheat+codesPDF 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_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 17900 bytes
SHA-256: e1af3fdcf4e5fec04e05742b7daf784152b1fec016adbe3c93cbabd8723299f1
font_02_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 10856 bytes
SHA-256: b086d8302873349df523e154d7c9894be67aac4326cb3233852f363e0fa806bb

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