Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb327ed72b655032…

MALICIOUS

PDF

88.0 KB Created: 2021-09-23 08:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08a42ae2b4a4f064ab9e72928ce024bb SHA-1: 8e5c5d6f714aff2f1d4ea5ba433732aefb57f67a SHA-256: eb327ed72b655032ae7ca0bbee0431489f09cd37c0e23268047ff8721c3b152c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to various domains, suggesting a link farm designed to redirect users to malicious or phishing websites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=the+raven+annotated+pdf PDF link annotation
    • http://msdoubrava.cz/foto/images/file/48756598390.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/17733697873.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/47178842401.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/jitolunegawejogukezitokud.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021921121244.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/44404082322.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba5a757c64---namuzalibudozijerojoxelo.pdfIn PDF document text
    • http://yanartextil.com/firma/files/sibenereviroxe.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/gosorob.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/35198429390.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/doxegeje.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/99088275616.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161362dcf01769---95034444984.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/53545921102.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/jizuzuzibofetunuzixiro.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/oc3hrhpqu5vs5q5kinoaqb1vr3/24116670288.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/tifewiroviv.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/zowoperonuzafuwedogigu.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/90315318455.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/vovefefizuwoxuzejugexizaj.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/6369719192.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/24193132116.pdfIn PDF document text
    • http://jaqalsports.com/files/file/68908705530.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/keloruw.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_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 17588 bytes
SHA-256: 1c71d26ff4e8ce99f0e7d5a2c0dbf081f88b43e7298c27e4ab644a3f17c0abed
font_01_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 10320 bytes
SHA-256: 108ec6123888fd8718f320e657da14b876a4c6aff01d47eca2b345e8412c5381
font_02_sfnt_off000139ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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