Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ab08aaa1091ade…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 19:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c84bbfa0912f6d3bf5056c994c95f9b SHA-1: cb4a727458ad277000e047f3b45a3835e4de875f SHA-256: a2ab08aaa1091adee07bf144d4f45920c8cf2641699c81709e1cd3252a309da0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://clinicamanila.com/ckfinder/userfiles/files/56176804028.pdf In PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/60907ce30479415df8be612efcb22b92/72771263548.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02b3a71dc---loturadusedeli.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/balabe.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/33592362944.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/senanabubovum.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/nimolufawujakutox.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/limifikaweziker.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/97243809546.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f585ffa5f70864cd38f8e226a8884c7d/fazafakofawamuwol.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0fec3f969---neparagawerexotubaka.pdfIn PDF document text
    • http://showdoimovel.com/files/files/72421494497.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/tapabuziwomagavetotoguwo.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/20818986378.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/39796707165.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/bepirazotekogajib.pdfIn PDF document text
    • http://fteq.ru/files/file/11848760163.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/parukawojajidazexiwidek.pdfIn PDF document text
    • http://djapm.com/userfiles/file/87465616821.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/41301366280.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/49039634630.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/mipon.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/xewusimilozalebusedijinew.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/26788436195.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631034932_1.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/29154657959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=euro+truck+simulator+2+download+free+full+version+android+apkPDF 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_off0000ca92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 18844 bytes
SHA-256: 0f0eb1fcc1a176b189e4c7a7c7fcc8b373f4f78c070848e5a3ab1f14b2dda644
font_01_sfnt_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 11228 bytes
SHA-256: 43e177a5872352692c33d66927bb3cdc63d58cb12ab11804dce3761c126cd204
font_02_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1