Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5696427d91532b5…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 01:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d75036a0f2a738c152316c332398e9fd SHA-1: 75ce764ba3d8e27debbf75abdbcb24a15f853563 SHA-256: f5696427d91532b5fc4036be2c237500aa8fadcc241f1cb76ce1362aab8dde79
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.deep2001.com/images/library/File/kubago.pdf In PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/nivejo.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210531010918.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/42523559833.pdfIn PDF document text
    • http://bakoca.hu/files/file/73802838179.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/dd16b0ac8589860708ce92c2518ba0fb/legezudu.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9ec1b3352b752f4d6afbb3a9cdc36a2c/nitexilogivina.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/lovuwuwix.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/sitasiwujugilidow.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/3921629080.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc29445489---95455453949.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708135be26d---52475973733.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/ralorajiwelurotumifibu.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/xakitovofogakotorirebet.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202108181930152615.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a87d77372---84459415777.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/nebipimoxopomudosusi.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/fedasenovenaxo.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/32515773145.pdfIn PDF document text
    • https://senhewood.com/d/files/38116594021.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/94114849621.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/lavirijuxigipokusagigod.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/46ea92a6a7cb94616bacf4b8c18f2e68/45884072049.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda88f4fdfe---64767271748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=jurnal+tentang+hernia+inguinalis+pdfPDF 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_off0000d2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2ED 10748 bytes
SHA-256: d27493666338e1de7d9daa6358edee898517f705b817e4241e623f216df7f8ba
font_01_sfnt_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 17456 bytes
SHA-256: b65aaf3913ce86ba549b31c821d95e18387fee1ea7f909bc587c87f219b1b3eb
font_02_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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