Malicious PDF — malware analysis report

Static analysis result for SHA-256 118388c21e385cac…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 03:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f512e8e5019f8f86acb7afa93541a9f4 SHA-1: 1be8295eb0dabac1d6999908ac49d9a3b95e0d44 SHA-256: 118388c21e385cac9966991f6aaf0e04a4c331758e890f70b41ca8116105571c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content. No scripts were extracted, and the document body was unreadable, but the presence of numerous suspicious URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pomodorolennep.de/gfx/userfiles/files/59602119923.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b57b6af00a4592296255bd1abc63b949/zitisadamunogiwugaxap.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/22548447700.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/12936260764.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/58900009107.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/zumanipiribo.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/bowofidomon.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a015083ff8---mofepoluzotugal.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/14953747978.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/38415626658.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///texojoveturasi.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/26903648727.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/2be2d50ab8fbb73af0e1519ed7bed5ad/lezux.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/81748498742.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/60211664196.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/35840081975.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07ba5280a---28091500258.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ada193dc8---rusudujat.pdfIn PDF document text
    • http://ailizia.com/userfiles/17003316217.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/beburataw.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/xusovizizisafapiwaxanur.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2add3ba00.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/20078316927.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/13392217397.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398cb860f50---76155619580.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/ralemakabopefepava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sniper+fury+downloadPDF 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_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 10600 bytes
SHA-256: 1e3f1faeee2a27d3e3515a98de428254639e76a242958f9a4c93d837834add3d
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 18648 bytes
SHA-256: 392f817a0d0b798212bf63d8d1484748eb78b3282eb355a0973c3d83f500041e
font_02_sfnt_off0001241f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1