Malicious PDF — malware analysis report

Static analysis result for SHA-256 927b09cfe4ab53c3…

MALICIOUS

PDF

86.9 KB Created: 2021-09-10 22:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c442ca8543b8f23c9d98bb0da0cd88e SHA-1: 0b57bf5c08e24679d920d6cd4f5d8a950d3d0d2b SHA-256: 927b09cfe4ab53c324aef937a11e9e3b28d851c295cfdefc3495eddbe37cfaeb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised CMS upload directories or disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://nbc.com.vn/ckfinder/userfiles/files/zomoreduzupupal.pdf In PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161361620b969c---lenabuvo.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109042255135509.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/98194763073.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/wigetolimabi.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/90820560587.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/digotonekogekemebajujew.pdfIn PDF document text
    • http://deltools.com/userfiles/file/wekazorawejagenasaxoga.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/37794008160.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/nijorexofuvefunit.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/95748460964.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd72b30ed---vugotogizunularererame.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/rabajalozitabilulul.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/42391342319.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/42228409329.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/kupijolenologerebo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ll9eeebada8hl7kqbi9u48r54/37679009927.pdfIn PDF document text
    • https://finliz.lt/i/File/miwanup.pdfIn PDF document text
    • https://tepihtrava.rs/files/1087516267.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/43026325946.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/63409281361.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613476d9a698b---90122816380.pdfIn PDF document text
    • http://kisito.com/userfiles/file/49475118935.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/061548234600.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138612fa1d78---40065469772.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/wejaramixovazawaxoj.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/81361528282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=good+multiplayer+games+for+phonePDF 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_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 17408 bytes
SHA-256: fee73c62ddf4eb683658e4d6936d146cf50c45680d22a8b0070b1ba6fafd89c7
font_01_sfnt_off00011c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 11200 bytes
SHA-256: b9a9ea3685513d3e329609da751af3bd041efaed999d5f6469141a9071dfc135
font_02_sfnt_off00013625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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