Malicious PDF — malware analysis report

Static analysis result for SHA-256 628987ce94a6dccb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 20:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b90c5b09633751a9b589435a54b380b2 SHA-1: 13f4e2bee69e41f9eae1fb332ffeb67b4d318aee SHA-256: 628987ce94a6dccb81d0e7c5d324294f696924169daac8be0329468a4196f360
204 Risk Score

Malware Insights

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

The sample contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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 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 https://medvor.ru/uplcv?utm_term=marriage+biodata+word+format+pdf+free+download PDF link annotation
    • http://bielwod.com/userfiles/file/1033581492.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kirerikebogig.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/34356505022.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/32202751288.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/77157553507.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/77768604819.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/u6js3tlvb1apptva0vdll7l455/ximawobuvito.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/2497798361.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/lonovemotorapenubixovuz.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/83ca0cef46f09e85e655330238f3e342/jumubajaxafilefed.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/94331720543.pdfIn PDF document text
    • http://spbi.cz/res/file/98744560471.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7f56bffcb1659996835277a574a9865c/kokazonitabivano.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/82583781948.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210606120338.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0cdd59f27---rorak.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/70036086281.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/38440301289.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9343efebb745c61a688ab5ac5fbafc98/90146420005.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1fd9957d0---57111563240.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/77428989012.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F6 21492 bytes
SHA-256: b9181b4c3d983867a5822b9060c2c2cb40d065baa7ebb536657a14cf11c37e2e
font_01_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 10892 bytes
SHA-256: ae9eff220e14045b1e62582bf4636c7e86891f3b70a4635f31862f0c82b13a46
font_03_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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