Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb6f1158abf8107…

MALICIOUS

PDF

84.6 KB Created: 2021-07-18 22:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96c52036fcaf5b6d1944dc7312df5eb7 SHA-1: 6c1afd4c3f4143763da278d74929bb9eebe4809c SHA-256: bbb6f1158abf8107f4c0bb85cae25032ed9b856bf2c0e11318b27c4aa80257e7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The presence of multiple distinct hosts and link farms indicates an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098337c84fb6---wexejepavizulemafarax.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739510cf0ae---10284566024.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0kqpkvl4itdo832579286ckhj2/rewixafunonirefuwatu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a111ddd70f2---wefuzeleloto.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/vazat.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3562bd84608cde0126553b6725af1474/wobezinafewi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a2bae4bc18dfd27216fc2391f4d1e022/xipufevumewuj.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/28950045474.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/88730256643.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/972a1bffe2ecf50cc30b36773165e7c5/75682241409.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c0fd65463---vikevuxajewolaso.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56690772539.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/lojas.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e913d064d20cf7bf9524c8780a005ce5/45322582355.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/vejaganuwavotiw.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779dad87d96---moditutenalositu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a402689cbb0---zebavugokapelirefudaw.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/37995439829.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/99466085788.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xumepesafimozo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bec9d6415---12202384241.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/wapuzotijilajumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+save+a+video+on+imoviePDF 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_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 10520 bytes
SHA-256: 3f06f38d3d1623535ddd4c5c12f8af5cfd8207feb201b423bf6d13635ba6a068
font_01_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 17244 bytes
SHA-256: 39c98de6ec56322bc1b98e162aa975f12bb82033889d75918ce2eced2ee3230d