Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39e67473d88ec5c…

MALICIOUS

PDF

268.5 KB Created: 2021-08-18 18:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 0e445b9e05ed4f61f3718e388ee55b7f SHA-1: 5a19fe46510824c0a39ca6f4842c1703dcbc6bb0 SHA-256: c39e67473d88ec5ce49ecdea278007f670b42344c93b91ca95a5032da8f37f95
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of malicious links, including one pointing to an algorithmically-generated URL and others hosted on compromised WordPress sites. These links likely serve as downloaders for further malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=introduction+to+engineering+experimentation+3rd+edition+pdf+free+download PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdde2bd088---90016668864.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/rifaletadalilelexubav.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/1a0c188ea66d29285d6c8a8306b4f929/kisexuwijas.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/p55aglv1jsbf4u5ds041015de5/jamaxiw.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/tubotevozu.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/97526884645.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/638f726a1deeba6c0352801491af4df5/gutijemani.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7eb554a9---lorinozolegugunivuguzi.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zuwelofukafasexabogijovuj.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/f3fcdded7a13934b3dcde43d83393242/mifarelagatotewinupe.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1f5493246029faeb7d84126c144c3228/zisawivafutakosi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cb55a2150---luturusoxelixabug.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/99973169887.pdfIn PDF document text
    • https://chptravel.ir/data/file/36499412987.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/juruxaxibegujupuku.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/lisamorafulafuvi.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/6091643835.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lrhnlosbsm0d2vnphq70gbjkv6/1134271441.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/82918546102.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/g377a5g8q5rig0vog9nckshs5i/39818104280.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/gudedifune.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/zixazidemikodenimup.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_off0003bb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BB4B 19736 bytes
SHA-256: 6cb7b388e6cf64db668e11cb2b05ba0f5f1e1fd9e7f401b25b68c7440b3b2254
font_01_sfnt_off0003f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00040818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40818 11204 bytes
SHA-256: 91ab2018da4ffe465cb0f3ea9796b155b201bcfdc694899265d2255a60819f32

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