Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b0bd9f7f8021f2…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 16:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 726d4bbeae82d01f811577cd9a7f8e39 SHA-1: b239d3d125b5f8b9eb0e52911f09ccf1d4bed9c9 SHA-256: 35b0bd9f7f8021f26799e3f8a4fd4232e570d08210018d80caa87e467f340ae1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest a phishing or malware distribution campaign, aiming to exploit user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=lindy+west+shrill+pdf PDF link annotation
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/d6b6547c1819d60c5a44f650524882e1/75835349488.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/musaweguwovatapurewumad.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/24473518223.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/o0r6mg4aookugipeiiiua4k7mb/livitirekudel.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/44014650153.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/57890824460.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/vinisapudixuzoj.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/bebum.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4ea3edc07---vosugiruziretabulegad.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/87682291220.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0629a7a22fa8ea1f9966a1a721645ba3/wefezuvazidubokugumofamep.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aebe655ba41---majusekovujow.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/27161825127.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/i3u6lmlsinp5o9vlpbqvnrnh3g/fubusukakazupaxemodeka.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/wovawi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e905c9eef38---zumujejub.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc36fbbb2e2---tewemilakowojalo.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/fugotazajegexixawi.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/jekusaj.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210811005307.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/753511ef2d8b268178c6557458fded9a/satizip.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_off0000c294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC294 10472 bytes
SHA-256: a52b292c48cdd484deb12a82003794878c70c8d7f81ae0224a679964758097e0
font_01_sfnt_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 17724 bytes
SHA-256: 707c6d646d865a6b9326010115581c132e6aa8f868a507603af90414d037c08d

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