Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e71f8c0ba309b02…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 22:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 250a0bb6bf14e16ee773c0f69b7a1578 SHA-1: 11e18a1fe4f54b3da0a85c25321a27b2ca57a079 SHA-256: 5e71f8c0ba309b0218d5f2d038709f656e2302f3846a5ebd770cbf5912bec47b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely exploiting a vulnerability or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=samsung+a21+custom+rom PDF link annotation
    • https://usssecuritate.ro/userfiles/file/90324995413.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/sotadokadoparuvipame.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/2462854070.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae977f114---laretifeba.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c369e6fcb1d2441bd19eb60f344dc003/wakabafofav.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/zusajeza.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/70930964100.pdfIn PDF document text
    • http://pactolous.hu/upload/file/niwotobov.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/34dcf2344bcf0a588c0b72b233b4649d/gapewulujirorun.pdfIn PDF document text
    • http://gerocuki.hu/user/file/zedowexulo.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/20961130383.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/vukumuroti.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/sagesamap.pdfIn PDF document text
    • https://koratspring.com/upload/file/fijefonisigil.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/sodisoxa.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tuzasejerudubita.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/dupabimebavowa.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/rawupisorigalusote.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/2253061153.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///52583572549.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133fcc197fd8---zopidukixenebegujefe.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/xatosogedinopotedidoje.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/xokipusekazum.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/48734190907.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dbc04ff3aab23fa12da34b5521705839/30388981588.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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 10648 bytes
SHA-256: 340cfde3e5d79c25a08441a7f124ada35285279a07cb9d87712130f633de2846
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 17464 bytes
SHA-256: c52cd4dc05f694df1012f762ec4c03c3d32a50a3715fce2708465d6f946912c2

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