Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bfc1711637fb6c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-16 04:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd0db2610021cbb99c5fcbd84071b918 SHA-1: cc5ca7d361d68a77e80629f3e7b3cd644db7c053 SHA-256: 87bfc1711637fb6c77272e79fa5dabc6b44a6d7b8592d3817af068f67cd44e75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The embedded JavaScript likely serves to obfuscate the malicious intent or to facilitate the redirection process. The presence of multiple links to potentially compromised WordPress upload directories and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cructi.ru/uplcv?utm_term=list+of+positive+words+that+start+with+u PDF link annotation
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/78599902036.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210908000215068390l4bm8t.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/47328953443.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/50164098184.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/jekowexu.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/rugiwu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d612079a5a---80753131382.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/60250043229.pdfIn PDF document text
    • https://frisch.ro/files/file/84590289212.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385df181e7e---fijukige.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/disutoboponasaniz.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9d44aa73---kudigitiwis.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/35249908820.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/53991839155.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/70290572614.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/gufadedanoz.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/95932803929.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jumatonoxekidumineled.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ks0u21uvavf34issddd4hhp2b6/vaxunuzafozodoni.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/mawexepanakumufen.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/80225859274.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_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 10652 bytes
SHA-256: b694d8daf04e23c22ee04aeb9417fbd1c5aa7a0f9f18cf76ce58a74e1f1ee485
font_02_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16376 bytes
SHA-256: 27a9fe6433c87fe9105c201afe356a07fc92c2ec6720870cd68db5a102d23776

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