Malicious PDF — malware analysis report

Static analysis result for SHA-256 611263979f3cbd2f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 00:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 996dadbaf82331bdd05b811c6a3ae64e SHA-1: c8cffc638a674f871e9e5709e36e5758fe8b0044 SHA-256: 611263979f3cbd2faf4ad78728f39ec57ca92628872204b2f3eb52682110120e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic points to an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=music+equalizer+pro+apk PDF link annotation
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381d403c3da---xapukubetujesinon.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/45035079580.pdfIn PDF document text
    • http://airfa.it/userfiles/file/lajisaga.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/satimojolun.pdfIn PDF document text
    • http://orenprom.com/img/account/file/zirofido.pdfIn PDF document text
    • http://cpviettin.com/upload/files/samujejukurenepezuf.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/45627387332.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/12829128938.pdfIn PDF document text
    • http://sql110.com/pic/jibitiwerovejimiseluke.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb864be77---92795881381.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a3720ab6f0c9c6aed22ab3136444073d/vofuxomaxap.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/mitatibuseruziduna.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_052825.pdfIn PDF document text
    • https://songhong.info/userfiles/file/29339235913.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/66916174465.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/fojidalomaropawegu.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/zirefuxurakej.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/77919321401.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/421qqp88sa3k2jnkkb5fburqqr/71746089445.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/xazugidugixixamizepo.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/86445161867.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/43908042324.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/vewefenab.pdfIn PDF document text
    • https://electroagro.es/pub/files/zoxemibesivolekebesad.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_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 10556 bytes
SHA-256: 9da64bb2ede230c7fdbe979840cfaa60bf9a8f2c822eb3cc546671e72f5e4dfd
font_01_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 18384 bytes
SHA-256: 754b10d35b5922c70ca8a35de362ca3e89e102d559fd1780b20e1dec37f0d560
font_02_sfnt_off000127ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.