Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff84bb45dc55cb84…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 08:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b5a37aa861eed846908736a9053a752 SHA-1: 580c79b7af83c240f123b01b617f6b411f287720 SHA-256: ff84bb45dc55cb84ff68ab4bab269f98dae15ea061a5aba07723a9c61104b2d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall structure suggest the document is intended to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=pdf+to+excel+converter+online+500+pages PDF link annotation
    • http://xaydungphongphu.com/uploads/files/14925475422.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/rewinovokoligowafodiso.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/23168783957.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143e8663d16a---35149240883.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/49794569595.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed44325138---tefiwuwajupekagadin.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/43677921121.pdfIn PDF document text
    • http://ippon.lv/uploads/File/pogosiduzigafujokoxurili.pdfIn PDF document text
    • http://med-os.com/user_upload/file/xolomezivo.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/nofopikulejowazanidev.pdfIn PDF document text
    • https://durimawar.com/contents/files/dosexobajimaxeda.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210908061313840.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/nazuwojijadenesirok.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6a365074---bavedumadutukojaz.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/dejesuxudor.pdfIn PDF document text
    • http://cityfate.com/files/files/74626208927.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/sirumepokovamuler.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/75065538694.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/21659831281.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614952234996a---puvolunapusevile.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161491f5646723---wufamizo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e6319da46---dewofegijeteti.pdfIn PDF document text
    • http://forum-auto.ru/data/files/riguxugixoxusin.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_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 11220 bytes
SHA-256: 51962119cf7fe12e7c768c9a5237b9748ae7f8450e71aa6116a3ff6e3655a44d
font_01_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 17888 bytes
SHA-256: e920ac56d13710172708294fda77650fd45c03f597f3daa5a0fe4f43e4bf6e0f
font_02_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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