Malicious PDF — malware analysis report

Static analysis result for SHA-256 09443be9f43fab03…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 16:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e34d1e5da56ad564ee8803cb0c1f0226 SHA-1: 50918da5a1105dadcc675fc2a85a945e419d62a8 SHA-256: 09443be9f43fab031159235eb00e0c7afd046312c603f0b78b14845775b7950e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, increasing the chances of a user clicking on a malicious one.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=live+net+tv+version+4.7 PDF link annotation
    • http://kanizsakran.hu/userfiles/file/xiwuge.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/zolomupimol.pdfIn PDF document text
    • http://licausi.it/userfiles/files/92624338316.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/20344122803.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/janejeguvamotesiboredapof.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/gexenasadudukofojulos.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/59453666335.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/99329899275.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141c648257fb---90787156586.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75393593197.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138e572edba5---70596543339.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/fenexorofuwamufisit.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-12/20210912151628216408.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/surezafetabelup.pdfIn PDF document text
    • http://sdes.in/uploads/lorasonejefivebetetak.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374eee1fbca---bojijisulezonovilego.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/zililubijaxupotale.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/nojumina.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210904013758.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/85012470114.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3fac3c65eef903a543510fdcf8a01051/joromasomewoka.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/89222841868.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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 17704 bytes
SHA-256: e01f18cd15926531f4c22be4b74ce55bfc0712017108bffceea584dc2cd1fa78
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 10112 bytes
SHA-256: 08a3e2af4fe071aeb36c7082c9cdbe58ffa954a2d4f12639db405c0bda3f3269