Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08279750d1c987b…

MALICIOUS

PDF

114.3 KB Created: 2021-09-17 07:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3db3ad3f27762d518b285484886d2fc2 SHA-1: 3859d216a03c8dd2fd03bed1a846436a34ee88ef SHA-256: e08279750d1c987b47a97c7fb1e215cab65d55f3889095cd1932a32959fe864c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. Heuristics indicate it functions as a link farm, pointing to multiple potentially compromised or disposable hosting sites. The embedded JavaScript likely facilitates the redirection or further malicious actions, and the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://poolpoint.be/uploads/file/68754133141.pdf In PDF document text
    • http://yanarfabrics.com/firma/files/25069780987.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/70534901005.pdfIn PDF document text
    • http://peoplefoster.com/pliki/fitotino.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/59756395208.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/jijewivisajizuned.pdfIn PDF document text
    • http://benetalent.com/upload/files/lagobutukipogeketimo.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/98726048308.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144072a667ad---tezesapumopivikafi.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/10169765600.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/xomajovidupuxajopo.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/83299942814.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/45911963097.pdfIn PDF document text
    • https://semut73.com/contents/files/23990738196.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210914075902.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/voraponawemojef.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f818e754d---74542306750.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/92692513627.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/64556595366.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/93607892485.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/gituvawagare.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/54976190952.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd7b03a86---19213100301.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/pagaruwimigumofobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=world+largest+land+countryPDF 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_off00015bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17401 10660 bytes
SHA-256: cd31a116469396f7004d7dbdfa9311705fd0722ebeba8da3d4e0a3317371703b
font_02_sfnt_off00018c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C6D 18148 bytes
SHA-256: 3e54945e9acbb52225bd1e693ed2f11ef329ac1388ac8c150c1f66c22d170e8b