Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57c299645b2bb9c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-10 17:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d84c32c387c6a963de02aa2a5fa60b1a SHA-1: af0fc1cb24e3349fc7706e21c9fcd7988320f964 SHA-256: e57c299645b2bb9c5d6f054050ecb774df46f68b2c0c8b14e8a0a97575af250a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and embedded links indicate it's likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://yamamatoen-wanwan.jp/ckfinder/userfiles/files/pawowixigogibibag.pdf In PDF document text
    • https://groupunsur2.com/contents/files/bovuteg.pdfIn PDF document text
    • http://ailizia.com/userfiles/60287153.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090712414352.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/noxanewuwebozilinafi.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/tukatajewazize.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161329d3b6e64e---49794443671.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/95646958787.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/87495247779.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/guriruwota.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16135f42b0a6cb---62474492848.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/lamatimogot.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/gewidojad.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/vabatufedib.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/78459692035.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/60963040405.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/wikebon.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/f9e0p2mvbvb596pug9c4sv5jm3/zutoliwegula.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/dowajab.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/63634358109.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec610a822f---bezaruzudutalenukil.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/38766245533.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/28266766155.pdfIn PDF document text
    • http://intertravel.hu/_user/file/57849880115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bandage+unturned+idPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/bexabam.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_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 10244 bytes
SHA-256: 82869af445d779f1d613365b97fb628fd05b1bf20bd021a27d8e75c6ac0ca609
font_01_sfnt_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 18116 bytes
SHA-256: 6099484a709e4bda9eab37d7725311209e30be5de2d9c0693cfc3e68633e96c8
font_02_sfnt_off00013033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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