Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab333b8660cf812…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 10:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d570b6797f0be386e95af291cd972f3 SHA-1: 4d9448b9f816ce8172f0b187cad21eae440a4fdf SHA-256: 2ab333b8660cf812308a738f6d1f06f29c92ca247ff4f364f0c104b487bc1d9b
112 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The presence of a 'download button' heuristic suggests a lure to download a secondary payload. The ML classifier strongly indicates malicious intent, likely involving the execution of a downloaded exploit or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=best+mp3+player+android+2020 PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddb151dc6---49113470685.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/jodozutobaxo.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/fumagogumupe.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/ruxasewureweneketan.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/govikoxijamikekajeledub.pdfIn PDF document text
    • https://cubic.is/userfiles/file/64289423064.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/96418062065.pdfIn PDF document text
    • http://jsdarvin.com/files/57541745217.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/50918075533.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613561d0dc2af---66715556973.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/sexebagujikenelej.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/99291400243.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/37762566225.pdfIn PDF document text
    • http://sdds.be/userfiles/file/7802454785.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137d2102d74a---zituzidopifeta.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/29742267047.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/60742186584.pdfIn PDF document text
    • http://learningkey.org/userfiles/bujeg.pdfIn PDF document text
    • https://grouptm2.com/contents/files/96772519767.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/xapexinil.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/nidugibanafewajudizan.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/rufurak.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9201e229f---95491546351.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/65972333927.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/seneloditajivoketa.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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 11132 bytes
SHA-256: fd212a52ab50022ace57f573cfde0ef831ee42fbec0563b1c3238db542da06ea
font_01_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 17952 bytes
SHA-256: d6ae9effdc95912fcf311e4c0fd95513673023ae90af230505a4d429f7f71515
font_02_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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