Malicious PDF — malware analysis report

Static analysis result for SHA-256 5790a1011d6a77b4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 00:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1e7e897240e489c3846a0d032502dbd SHA-1: 63c891a661604c87196bdbad4c0b3d6a90578026 SHA-256: 5790a1011d6a77b46846eb16ddd07b8364ae63fb1512493349f86db4f4980fe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to link farms hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these link farms and the nature of the URLs indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=anx+camera+redmi+9 PDF link annotation
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161314d185aacb---luwufa.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/xiguwodebedukajebe.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e60a22f1d---mezupunuda.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38e38a55d1a2a932094cebc0e320ba33/rutivagekumevuxifopawijid.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/belenizigawumi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1f8a65f9---7044871468.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/mafesosutuberasipiguguzog.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/zaxozutakizowabalotesi.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/41718231546.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/tupokitetuk.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/jotudasakawujulesobed.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/jixojobolip.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/13262975380.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312256ceade---vatowasunageputemevo.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/15888082539.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/roseganaxotebudud.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/sitawagagiwepalaxoduka.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/54339672268.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/gadepevoxur.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/pasafuzolufepaseravota.pdfIn PDF document text
    • http://wych123.com/upload/files/46470415916.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/32520877470.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161309499179ec---nelekibakifapilobowop.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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 10348 bytes
SHA-256: 523846eb52bfd9d00227aa6dca2b12368636d258087578183d0e0c76bf34b3bf
font_02_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 17040 bytes
SHA-256: 753a97f22f406500387f21267f55f0bfd4dbffb2d62ac8bbfb3ba0873cfcfdd2

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