Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba906a05415ab6e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 02:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e821bce7e1bb8b65e0d4e73c593c3b97 SHA-1: 89aad1ce87f1696c50be806dc10b71cfa715204c SHA-256: fba906a05415ab6e4acc5fe9868b41b2b29c1179d264fc13ce91bbc296a5e3ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://oniceh.ru/uplcv?utm_term=blk+dating+mod+apk PDF link annotation
    • http://livestocktool.com/d/files/xikevugekuwovumitedufa.pdfIn PDF document text
    • https://onlinendttraining.net/files/87367136940.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/lifubexenerasoretutaxuk.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/15048162.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/40569832372.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/15069286202.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/wakelixawozulakufeva.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/8450381115.pdfIn PDF document text
    • http://saaretravel.ee/images/file/65509736126.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6m857kpjimlkvlphvt59rtnlrq/76229877717.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/gejafikevemuwur.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614130d7b0506---gibekesuxujozudive.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce914a8c1---10233902062.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/noxulovunofirukupesi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138492f3788b---ziluborixo.pdfIn PDF document text
    • https://hse.tw/upload/file/wewuvidejez.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/90568727626.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e19d62a249---xipefofa.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139c108e2498---27613344286.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/sefoxetowu.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091413292173499.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/43361078789.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613121c14021e---takotonivuzaloxe.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/biwesejivuvafubawokiz.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_off0000bfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD6 10480 bytes
SHA-256: 013b1ba46435fc737d038bbfef942280734bd580530c8d4210141959d92318c3
font_01_sfnt_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 19032 bytes
SHA-256: c84dbbef69105d440bac045c113e2b09f355e38e42a2c410f0436c11e3401fc0

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