Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd3e31d31af3b01…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 03:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3733fb585a6afc8676acac86d4d3f3e9 SHA-1: 25928ded4d7dfbae5fdcdd7b9402dd3e3f9db41c SHA-256: 2cd3e31d31af3b01ec9f25bfa769976943c418c100e3adb092185c598aad937e
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e66a1c804698d69bd67cde8dffb9a81c/69987503023.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/f5rk6e5s5rsp807h7h6tif0daq/25952610751.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/77034192945.pdfIn PDF document text
    • http://firegallery.ru/img/upload/78851952297.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aace052609---55329855676.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/fekumoxutez.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/5892762801.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/gowales.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210907_181622.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/2192331341.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/55828698802.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/wutakumenotutofunegekusax.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409fefb9a7f---22680271378.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/68684211156.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/63346958125.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/82087000224.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/lazasiboranaseje.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/xalozudota.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/22528417094.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/75690965551.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/77633747399.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/tumoxufonokejel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=install+playstore+in+android+emulatorPDF 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_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 10716 bytes
SHA-256: ae0dbf9d33228fc43dce42feda7245012867dd8e8f5d99b088fe6148148e5c89
font_01_sfnt_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001057f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 16580 bytes
SHA-256: 3175cbfaafb4cdc0d828c2a7438791ef079a09a159af88dc39a876f2360e8f8a