Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cc34892097f2e6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 21:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f8c2a4e5c3b612299ef4b5b43b11d20f SHA-1: 35c9015366162ce29b24553247c1be35f5e807d8 SHA-256: e9cc34892097f2e6999da63a8aa1470f16cb7401426e251672ba31a83796d028
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://bigdoughpizza.com/uploads/files/rixoledobul.pdf In PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/75120242718.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/41612315843.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/woduxuvawarunibatakaze.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/20515251309.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/37659498380.pdfIn PDF document text
    • http://cecev.com/stockages/files/nixuv.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109110707453612.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/kesevutusukijugisitaw.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec0c31e65---30690383993.pdfIn PDF document text
    • http://dsraxys.com/uploads/38458036239.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c649fdf5fcfb9661d0a64aac91dae082/76474623101.pdfIn PDF document text
    • https://mimpishio.com/contents/files/defevibijidadi.pdfIn PDF document text
    • https://heyratacademy.ir/file/tanabelarudodepe.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/45670267081.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d30e4360e9---83206803091.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/wolotexewoleletiz.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/91009642182.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/72019872626.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/17520959168.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/40040248030.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/lofisedafusiwodofipe.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/25027379910.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/vanisovukezerezufibonised.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dungeon+maker+apkPDF 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_off0000b834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB834 10384 bytes
SHA-256: ca07354189423158530be13cf01561978ed1a15de1f9b0d18870a8c02976cf35
font_01_sfnt_off0000cf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 16012 bytes
SHA-256: 53f94612d074d598f54025690088ddc216fac94872aae3aa9c650f6c9b933cb5
font_02_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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