Malicious PDF — malware analysis report

Static analysis result for SHA-256 0653e8f0bd168518…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 09:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dde99d6df2797e37acc6e3d7884bce7d SHA-1: dc265594dec0b52c7b11936e933c223a95a1ae03 SHA-256: 0653e8f0bd168518fc5c4ea6516304eaae8bf5e30d1ce1f0414ceed2489f932c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://dulwichtaxi.com/survey/userfiles/files/noxeduko.pdf In PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/lotumekatibebugewi.pdfIn PDF document text
    • https://norservis.cz/files/files/kodegusixulikimifujutu.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/xilise.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b5984460fb2ab1abd2281e722ede4da6/lutinapa.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2c57bf67e8b24673f0c31976328dd9b4/kogupapatubimu.pdfIn PDF document text
    • http://homeopathyhk.com/files/napigezoxixolojinumowuxe.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/60176918309.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72071173950.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/robasinifipepuximiw.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/pixovuvegit.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/38328566190.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/36163922427.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/28230715897.pdfIn PDF document text
    • http://akademibt.com/resimler/files/45770534345.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pafagawimupile.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/nalegoxapetubop.pdfIn PDF document text
    • http://gibisch.biz/files/files/janemafemevopobipu.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/54465546495.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3bde35a20---kulovumojuwulex.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109070153248618.pdfIn PDF document text
    • https://masukpt1.com/contents/files/motizemisofejulinopive.pdfIn PDF document text
    • https://novitas.ro/files/vebuvijenifewovev.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e53a7f38b0---bekonizabi.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/71850017136.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/90974794488.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/vupopakonakofodanixuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mise+en+veille+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_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 19848 bytes
SHA-256: 36a79cd8478aa9a49e66b41d42534566a0394cf5b300db551f2f7a9a82b6b1fc
font_02_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 10200 bytes
SHA-256: f93adac1577e700ef3ac1190b6948ed417ebbc77ba6cc585c031ddc85ed2dd39

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