Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bada5590d89c338…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 23:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 484b88abc139a212bca775ed060191a0 SHA-1: 5c4ddcb69b06389fe4a599e91c3bf733f8eb4201 SHA-256: 8bada5590d89c338cd605f29cc737a6aae32af9f4fa081b2f659470d7dfc6d53
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The presence of a QR code lure heuristic further supports the idea that the document is designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135028a9f7d9---xonubadagidikud.pdf In PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/finitarisexexepon.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7427080b8---45708129847.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/55333959478.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/sefebitaxebuwi.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/95200018337.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/11118095088.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b56f3a617---61060433792.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/jipanekudatelowarejo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3gj9fuja3r44jvrlo1jv5gvrr5/minonupakusutetaker.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qppnuo0co3ntjbng62mv4t0khd/51698945271.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/4a8770655ec78d86f50c411f5a8ceb54/1983819427.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdaf52a35---forajizajoni.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/lafolozenu.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/tunifudofilaboxokewuligo.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/33592800448.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8fdf1fe09---babetizakofadugu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/n3974k6bhk8tdbf82t97bp72l6/81734682557.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/38248886498.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/sogovapuwolojewexeroja.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/dovabolaguzerixolutevumu.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/tiwasinoniwesazibebi.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/10568631810.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630572693.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/5132214270.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/99995698413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=scan+sample+qr+codePDF 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_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 10704 bytes
SHA-256: db1deb0a492277eb2a1a6d5002ccaea79a9c9d3f661aa440bf149be97a06bd50
font_02_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 18064 bytes
SHA-256: 48c2cbcf1e0f91abaf36678344e9181d4be1307757df5239d199ea280ef9d981

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