Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ed17457aa5a404…

MALICIOUS

PDF

79.3 KB Created: 2021-09-23 15:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00990415fdf5d3e4046b939a7b365277 SHA-1: 3c106c17a0a3afc3edbfc95090c4ee2f4cc4a9db SHA-256: b0ed17457aa5a4043487069b8ae9dc21feb4a30565be374deddf425e350d9ac9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=how+to+generate+imei+number+for+android PDF link annotation
    • http://novafish.it/userfiles/files/wifesupu.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/45380703771.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/72155707606.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/bonog.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50b9c56f1---71922124261.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109060834267501.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/manesemuvaxubilax.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/52753466521.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/seboguzoxajuxegenuduf.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/56726310785.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210914084407959.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/50554262574.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138cc70dc736---176028384.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/zilitosepeti.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/92114341391.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141389aba4b0---sujulesug.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210914_060946.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/cf122fff33a89d64f7e616eea6824fb4/pevin.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/nokubogikakaraf.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16143926889b21---42530516204.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/77687658269.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_off0000d0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B5 10800 bytes
SHA-256: e5b18bd9041dd257d8eb1d1bd6d9968a3a5b690691ac926e0ae81bc6192afa27
font_01_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 17736 bytes
SHA-256: afbe19706b08e261ec75db46100cd5ad62e0dc299bf237897afd60431dc914e3