Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e63776277ba7e8e…

MALICIOUS

PDF

89.8 KB Created: 2021-08-11 22:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9636f8f7040d0ce04fd39d561f8d35f8 SHA-1: 0044c2285fa16aacd88a8e2a6c7e9070a785b233 SHA-256: 9e63776277ba7e8e8f60cb45ad5997d0ce68b38a552db887501de3443204e27f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and a link farm structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cncunse.com/d/files/12335511594.pdf In PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/50892398420.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/124ab399153155c254e7721d40bdd7d0/67533248213.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/61742755072.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/levirotaxiwokozas.pdfIn PDF document text
    • http://consade.com/userfiles/file/zifuzatavu.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/dirikipewuvugila.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/44232036398.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lmvngj0bkmini122jnkn9mhq90/jeforefitat.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/zesaxuxovowobe.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823fcd514f6---mosuzusekukalife.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/neriradubezorigi.pdfIn PDF document text
    • http://bucketdiaries.com/uploads/files/90744884255.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796e3f6a83d---vovuba.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723447cd92c---jirebadowakivene.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/15296599511.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/a0b19af4ecaa5b62a0b7f06bb9e94d18/96815263061.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/80851289303.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cfe9866f5c45e25e345172543fa3207b/80745494376.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/rubotarojipefa.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/12801905702.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/43039797526.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/2802882290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+incorporate+grapefruit+into+your+dietPDF 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_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 17452 bytes
SHA-256: 5ec7c705f30186c9bc1c30245202ba205c4fa617fef37480aa6a036fa3fde689
font_01_sfnt_off000127f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14007 10872 bytes
SHA-256: 424665b2a15bd381aa498aaf360fb656667513a387c48788727f4df506c2f5de

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