Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8fe0a39f56b71c…

MALICIOUS

PDF

86.0 KB Created: 2021-08-21 07:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8828bcbd2692f68cc1acc1f3c44b6b24 SHA-1: b203e809bb342bfd7b79fd1221f7977bec4ff347 SHA-256: 6d8fe0a39f56b71cdeeca7bb5da303202427a46e3c81137ad4a608e12dd6ebbd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the primary attack pattern involves directing users to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=what+does+the+tree+of+life+symbolize+lds PDF link annotation
    • https://sasalidayanisma.org/uploads/file/47486922708.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e065514efb75c81aa77001413be182b6/96784247525.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210730235547.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/33748161182.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/kotimukoxakazivegapuji.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/55306988525.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/fafub.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/sepakedepifexevupivola.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/52694761802.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/guvibijeferisapapizubo.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/tutusivifipofanemekuxinu.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/womok.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e420df55a---dekelavibitapilowik.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/3367699021.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4fc45ee0abb92236a260bdf92065539f/zepijaramagoxatuf.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/896017420694dc417961fd723df50ccb/70178437669.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/duzalipinudano.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eeede8c86---jawuredokaxi.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/jurinafozedamixujagokuz.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8e0707759---junuwejak.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abf556ab9ef---18194192360.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/8787790658.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/jatepuxawikoranuzijupum.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6916b59907---33029108706.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_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 16840 bytes
SHA-256: 4cf26c5c431d24c2e0f36e45af24bb816cbbc3e829767716045d391a0595c570
font_01_sfnt_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 10824 bytes
SHA-256: 14c028df91951fd589d620c683dad08bc1e6c5b8201ba5abda766d7f62bca4b0

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