Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ae0e59e4d07d7e…

MALICIOUS

PDF

89.0 KB Created: 2021-09-02 23:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2f7a15f23de4e3218575b94a958a9b2 SHA-1: f2bacad2321350e4771d7034deee576dce1bd73a SHA-256: 49ae0e59e4d07d7e2f7662fa70d7a02f21f31a242d25e52798df130b933a9f6f
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. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains or using compromised CMS uploads. The presence of numerous external URIs suggests an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://a-daily.jp/app/webroot/contents_img/files/xofafe.pdf In PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccae2c9bc3---42944203547.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba268a3bffb---37190942528.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/86727161484.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/mamop.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608103b1ea647---sizidexexefata.pdfIn PDF document text
    • https://denimder.org/resimler/files/91387256630.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/41018659961.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/12320766647.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160802269d4e78---82043974570.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/lizexelubopewafatojelez.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/43gi11usniqd7a5so8e8vn0ii2/wogejezawikigowupizenugan.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/joridivufoxovano.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109020906388278.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/kikusujetilitiguto.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/jarikolinixubojoxakok.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/xorabuvatojixoba.pdfIn PDF document text
    • http://inncredel.com/uploads/43084780568.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/zererotugiwumifawalu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768da6b39c3---ruzabiwofaduz.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/jetusegupezuzak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c3500e308---44644878182.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160766c7489f86---55232725071.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/421921796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tozer+man+the+dwelling+place+of+god+pdfPDF 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_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 11008 bytes
SHA-256: 81539794f93af36095b1b9c35394c8d7ba4eb14214f13c9d002cb27752bc5493
font_01_sfnt_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 18340 bytes
SHA-256: 83ae0e8624178947fa557e36307d0952fd1fb08f7a5d1410e319e6cd0d96db99
font_02_sfnt_off00013e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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