Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af82d09f7701a42…

MALICIOUS

PDF

77.3 KB Created: 2021-09-11 10:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0d7fa1903db195854d9e471d858b21f5 SHA-1: 2490ff1906d5a8717e27bc0985918ee34fa889bf SHA-256: 1af82d09f7701a42f47168348cb3a9e2fdb441b3f52ddb6463036e3293195a1e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics further supports this, indicating the PDF's primary function is to facilitate access to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dulichtantai.com/files/uploaded/files/vesovodu.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613515e9a7d01---27832031565.pdfIn PDF document text
    • http://hijoin.hu/editor_up/wadezuluxubepitaviramipam.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ed3e9b827---35004331026.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/6185554675.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/pizetaki.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/72126148485.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/lemozuso.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/mofobuxumupibewiw.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/gozemevepedijoxuw.pdfIn PDF document text
    • http://elskenecologie.nl/files/49049719634.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/madalika.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/dizevodunelepi.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109100507118391.pdfIn PDF document text
    • https://synersys.fr/contenu/file/zibifidawexav.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///40129913591.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/54558040358.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/zanixojojenininuwosolo.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/badopafakadutevopijaru.pdfIn PDF document text
    • https://dom-titan.rs/files/20070152318.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/24489396543.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/jijaledaxud.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137b0b2c657f---wonijagumowapib.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/pudamulobusitifut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=uncle+tools+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_off0000caad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 10272 bytes
SHA-256: 813fe20ad6c89754532c8706dcff12bffc47a70af3e38f81744394106586718d
font_02_sfnt_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 17472 bytes
SHA-256: 8d8caeec8203ebf2f2fe73b236c709ef98b33b657c1100c0d97369270f3dc472

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