Malicious PDF — malware analysis report

Static analysis result for SHA-256 516e213abaac11f1…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 12:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76eba00cb9ff597a1dbc9d396409e8b7 SHA-1: ae0f26b19ec7b5654ceb336fdcc19f5986d536ab SHA-256: 516e213abaac11f15c4e7874e9601fa692739a44d82f2318d08376c53fc91bb4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, potentially directing users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ardeche.proximeo.com/ckfinder/userfiles/files/fukavexuvofegupemewukekuz.pdf In PDF document text
    • https://shirbandifelt.com/userfiles/file/sojaxamomaf.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613818fa8befb---fibijinigejakesabumupaxek.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/3635550254.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/26756781613.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/pepimuguvusidapanevej.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/pipekodegawagov.pdfIn PDF document text
    • http://dasbluemchen.com/52428170762.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/7625698264.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130736770eda---nikukewezesoj.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/59013473569.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/xilufe.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/kobejifojeb.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/namowaxufujewokotawodipu.pdfIn PDF document text
    • http://guowangcable.com/d/files/19331689792.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/4456570380.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/35ad30b151ab60908d86f1128bf6148b/sefilub.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/nireja.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/90199594221.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/46197240.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/49302027925.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/neviguvubajobaxefegaxuv.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f187c50fca---91612263710.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/kagopi.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/napimepipumekemoxipiwa.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/mumiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hello+neighbor+2+androidPDF 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_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 10512 bytes
SHA-256: 31844d201589ccb6380a3a37acddfe0a6b49d566e64d048509f70b6fa592d8d2
font_01_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 16496 bytes
SHA-256: 4b7085561cdd8343f5b7760d3783884749dbec472391a1e9a1028199b1f0ee0e
font_02_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1