Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf598be0a34f6a69…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 19:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2035bff79dbebe4ee4609295b7fb71fa SHA-1: 4fd19e3cfbdbf4a74f681d527b6aeedf8bd20ba6 SHA-256: cf598be0a34f6a6951b80a2d23d3c5d9da5e1bef914c3ab24a0e596d13320563
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests it may be used to further obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://turnyras.lt/Files/file/kefuvobega.pdf In PDF document text
    • http://ryyw.com/upload/files/2021/09/202109011729112146.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/kilirugexovosizoxibogij.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/29281101133.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909125909.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/608216394.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138971560f29---90512147127.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161338e9faec00---xidazovazezomitegigumibi.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/51762147592.pdfIn PDF document text
    • http://vkts.se/userfiles/file/geseminokadanivik.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386fd20ccc8---toralokolisi.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/54410399087.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/jegewikosovumurike.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/puliwobevudurisivaxa.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/lozodunebidufapu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7562d3f7b---37585738295.pdfIn PDF document text
    • http://pactolous.hu/upload/file/pikevido.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/vebuvukegib.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/21858361226.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b7319f7e2c768aa29ac126f0a89832ca/89457359426.pdfIn PDF document text
    • http://friulanapanini.com/images/file/29899965346.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/63540388068.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/kamepapebipem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=silvercrest+smart+watch+app+downloadPDF 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_off0000c54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54A 17544 bytes
SHA-256: 591dc2f245c7a0b8e67c5710c4062b6c02c9fe872a5d8140e775c3310832a4c3
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 11004 bytes
SHA-256: 0f216043d2a88971e816d5b526f22f60998a796e50dcd9f28e8935f36013743b
font_02_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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