Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de71a332a49b58d…

MALICIOUS

PDF

74.8 KB Created: 2021-10-04 20:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afeb5cc26ee77427c222c15516845886 SHA-1: 1e2c2ae985e2dcd2559579899f2478e75f62cc17 SHA-256: 1de71a332a49b58d0ab5f1a74f7e6e968b5d6fb813d3e23f97be06ca96c4b89a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, redirecting users to various external URLs, many of which are hosted on compromised WordPress sites or disposable domains. These redirects likely serve to deliver phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://irlanc.ru/uplcv?utm_term=all+grace+abound+to+you PDF link annotation
    • http://newgrids.com/userfiles/file/78548401323.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/mumakurinaluloxif.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/27098063961.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615115a39ff03---18287602202.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/74281098835.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5791e6a31---83485995551.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/22471139648.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/xomodexexoxerivixexiwot.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/48893655063.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/kurowuwatopizedewom.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/20916051283.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/39068913500.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ea11e2f---8922921143.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/vusevaxanizetixogijisib.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/35264767963.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/59319940121.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/35126504731.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/tewaxupebujaregu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485f9e50673---nebiwogotadopaxubepug.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/91671641265.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/79809006800.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/81046364937.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/nenazivufibavobopitabod.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/74909615583.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/89557490096.pdfIn PDF document text
    • 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_off0000beda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDA 10620 bytes
SHA-256: 04837953cf65bc44fa0405d74cc1e425d9df99149b922329dbe2693cb0e59d70
font_01_sfnt_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 18384 bytes
SHA-256: 28b557e8b53271614a0d72b4cb792224c941887efb94ca2d5107e0cf0e795c3a
font_02_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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