Malicious PDF — malware analysis report

Static analysis result for SHA-256 e280452856331102…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 19:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d4f3c8b506e0509c8db05572895a23f SHA-1: 365330711d262abf54365a97b6d8595352f71c21 SHA-256: e28045285633110262f64d2bacb31e7451b341e87643a65862b5e595c4070efa
156 Risk Score

Malware Insights

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

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. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea51ce4949---toxebimivijubusego.pdf In PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109060252502334.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/fodagezidafupivudo.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/12714549746.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/vavobososenawa.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/33793819491.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/61631674901.pdfIn PDF document text
    • https://securitydm.com/slicice/file/50271403167.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/77081020865.pdfIn PDF document text
    • http://exima.kr/userData/board/file/sigulonekuxapokefelegi.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/foxuwuzulewufuvazowesefag.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/45721207710.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613510633064f---rokilozikapirex.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091018353062.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/pugodozutewuxaduzo.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/45135911537.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/91342102448.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/pekizukokawaboforanu.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/mawupalavutidak.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14694008463.pdfIn PDF document text
    • http://moristas.com/userfiles/files/24739199387.pdfIn PDF document text
    • http://annabarons.com/files/files/3271507403.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/27664190858.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/11f8d8eef8b0d196bfa5bbad9c13576e/18233847111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+fm+radio+app+for+android+without+internetPDF 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_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 10956 bytes
SHA-256: 80292196b9a281efd542936293768a082a1c693cae4cac226b4d22772acd6416
font_02_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 16740 bytes
SHA-256: 08b6363f83be5617cb236cfcfc5d09392861a542d16d92bba1b4e71bb105fa8e