Malicious PDF — malware analysis report

Static analysis result for SHA-256 da036c1e54c0188c…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 00:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 38d841e88e22d7f618a479a75c901c2c SHA-1: ad7991e6970418b4c909f38d75cf41d73e43d750 SHA-256: da036c1e54c0188c7cdfdf6095d7aaabdb5d7b6db34e867f4f1730e415954bed
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and numerous links, many of which point to disposable hosting or compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://pcwenhua.com/uploadimg/file/16309107601504480337.pdf In PDF document text
    • http://soles2walk.cz/data/file/tivepugexajamuliwepibofop.pdfIn PDF document text
    • http://quetthe.com/upload/files/28693649737.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/20356191234.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/63122313729.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/nalirutolijixalikavuwuda.pdfIn PDF document text
    • http://trieuduong.com/images/Download/19611364130.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/bedejakoxobigab.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/tiwozomevogezibevamenijox.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff6dec452---25086817633.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/gevenu.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/75727451494.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cadfe15282bcadc78f09485a0421ffb3/dukerovivexur.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/xizikosinotixikoxexegemi.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/50799157631.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/40009496463.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/81063454635.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c1e2a2cea---82405635104.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/26789730203.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/92425366952.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/42703588683.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/lugomagofofezepadosozu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495022de20a---bunepitakewow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=super+mario+land+gba+rom+downloadPDF 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_off0000adb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 10868 bytes
SHA-256: 9f233509c921956fd540683bb1ac47851a682de27dfa78fcf50620ee9b40ec1f
font_02_sfnt_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 15296 bytes
SHA-256: 5e1f7b2b76a8a0f289e76927fad5b2dbf9ff16c21da5dd9dffe1c2d416b7eaf6

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