Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e8633add32f7a5…

MALICIOUS

PDF

168.9 KB Created: 2021-06-25 20:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b1ad472b12ac05facebff5a0454790a7 SHA-1: b292ea277f6570fe84c4db5c5146d92cf113321a SHA-256: f9e8633add32f7a5b3290a2cb6afeb8b5eae4d3791d7c58444cfc0d7b80b6946
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm pattern is a common technique for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://pistant.ru/uplcv?utm_term=plato+and+free+will PDF link annotation
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071e29e64ebe---40469517216.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/bokojibekebizovewila.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95694e2b7---vopejagagazumizito.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/96182678438.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmjdi1ciqhcqa2e9gjnoit2d82/5511539908.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/11559917107.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/gulonilala.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/1060518172.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a13997d09d4---19117120007.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/sagigexobobofolugerom.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/82858016347.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ad88f64306c---33123677771.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084d24301e8c---99614936637.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/julugetepijijovafa.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lqac8qh711o39sq0bsapfhohrs/6799890264.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/bojizuwadalaritetatemado.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/pewazegumofovugokum.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/20762915472.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/wisalapadigijojigosevov.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/nunaxonigetaresigasen.pdfIn PDF document text
    • http://rayanchem.com/d/files/limar.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa4227e843---tugevazum.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8c940a15---kufikaxi.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_off00023776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23776 18236 bytes
SHA-256: 6e39b51cd849ff558cb58b078770ced6a6d689b26e6f0db9135e1fa9d617ea66
font_01_sfnt_off000266eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x266EB 10268 bytes
SHA-256: a077d09a019134d7c745187427a6220da944b9ed6672916ab9c70c0657fad1a1
font_02_sfnt_off00027e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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