Malicious PDF — malware analysis report

Static analysis result for SHA-256 66368f8191cca774…

MALICIOUS

PDF

97.2 KB Created: 2021-07-02 20:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e68d7ea318b004d8a79f71cc7af4b42b SHA-1: 4ac63c9185bce6b566c05834688eacb894ff738d SHA-256: 66368f8191cca7749af6c619efc7bce9dbec4bf2e7284a8cae79e503358a6080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8ad52144d07f3efe5382f93f1a075767/miwolimatudotumugixa.pdf In PDF document text
    • http://3bbb.fr/ckeditor/upload/files/nuropurabakupi.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/bavitovovajusila.pdfIn PDF document text
    • https://tekartltd.com/upload/files/xomaduxavowajanajolo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/kktr4t8aql2jvhf35a6r70tdot/gidetevojulikerije.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/50622251635.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/g7vn751f0crm52466l6s86d11g/wobokosar.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4a1b7c348819bec8b2cd9847e6a3fbf/63339424838.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4d45349ca---45622392685.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/mafasezi.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3422d1bcf---32288255126.pdfIn PDF document text
    • http://hodori247.com/uploads/files/92238859905.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/14153077389.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/53512178015.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/27275242922.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca5a20faa8---vabidopakadolupusir.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xanixefex.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/35933407302845d7ce6574cf0c22b93f/54270054982.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e248491556f5ae051a2c5a42b11e78d1/39053540313.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/nugoduw.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/21293787382.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/11185321891.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8720a3a74---pozovurewusudiwikebomo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/m8fe046k3ju92m204781o0m10j/lorobegevexedaragexizigo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0272048de5bfd342b9a049ab376ff2ad/16551197395.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/626hb18vipq5hb7srsjm5v6mu1/4953824461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=exalted+3rd+edition+pdfPDF 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_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 10580 bytes
SHA-256: ba4752c570ade241325fd78c77793121453f8e06a90346f70424f2effa9b88ac
font_01_sfnt_off00013073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 17724 bytes
SHA-256: f878b23ea6aece292f7a644db454225267e9ced5957a2694b608736b7d3f0492
font_02_sfnt_off00015f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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