Malicious PDF — malware analysis report

Static analysis result for SHA-256 1744da4fec495d4b…

MALICIOUS

PDF

90.5 KB Created: 2021-09-18 03:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8c2a2ecd306d699444c747144f335fd SHA-1: 83ca62d13793c1aa991c42b793ff07a4df574f6e SHA-256: 1744da4fec495d4be6bdf7169ebc4158e12c95d5a27395c638a0227478965e21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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 http://ingenermarket.ru/userfiles/gagokajufovigepupivi.pdf In PDF document text
    • https://ihappywash.com/uploads/files/202109132048167177.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/36134859978.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/xelasavujepebiminubef.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/wuzuzigovikuvu.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/95147170993.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/lororopijijobufumivujanuz.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/49844495979.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///81429762827.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/59868776517.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/67683458048.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f10c7e47b---92584982398.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337c06bae4d---wufujevixafavajizosemop.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/bafos.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/54519845487.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/952311445.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/58871399593.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f30f3e2375---dimaka.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/99259084768.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/begesipagawaroloviw.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/87188965092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=chocolatier+para+androidPDF link annotation
    • 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_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 22912 bytes
SHA-256: 78201aea3598720367e6eb0728f4772f3496ca699d517b2e20f09340fc9d5ba9
font_01_sfnt_off00012cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEA 10472 bytes
SHA-256: e51fc9932a3c2774039476166941e93297b53658108634724fb2aba4e08ed379
font_02_sfnt_off0001449c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1