Malicious PDF — malware analysis report

Static analysis result for SHA-256 041c1729471485df…

MALICIOUS

PDF

86.3 KB Created: 2021-07-19 11:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 28e7f2d6895ae6bdd98c8e0b444d6026 SHA-1: 3aa4eb0582b273a45ce1fa7653183c31e5286e25 SHA-256: 041c1729471485dfc5c8e9601e889e1517e546765a1b6e6d5862ced7fa05a638
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The lack of readable document body text prevents a more specific analysis of the lure, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://absolutelyneon.com/userfiles/file/51593954515.pdf In PDF document text
    • http://hanabi-la.com/uploads/files/28419488714.pdfIn PDF document text
    • http://merwepizza.com/upload/file/89995106641.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb16d81cf7c---xojebiwexa.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/mutokedazopezeji.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90f8aab96a---96189932167.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/viwajubewagix.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/32754396289.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4751da81---13409275943.pdfIn PDF document text
    • https://signika.pl/Upload/file/vigodudag.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/003bf0297144fd87f2ff19b6c1aeb606/49631807336.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v9orjnbcle9v826flrf4t27e71/geguvuwudaguvi.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/69581070730.pdfIn PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/jadexerizuzoga.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/12632655153.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925099e4f05---jifufune.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/87593517101.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/xujaligogivumumujeduvufu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5fd16ee0---vekep.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/68731212945.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-10/20210710091517497931.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/pofixedesa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b3ef0ca4---fibepapewujenul.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5563477b---materinexes.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0379869161---pubafasubisubob.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/xepaxudezivolojuki.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607783bb033df---notubun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=general+to+standard+form+circlePDF 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_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 10676 bytes
SHA-256: f577c0c403b3d1b2239574a1cee34b91d76663ad36bd6adc1eb0322db413309f
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 19860 bytes
SHA-256: 29e6be4133b878e7ae5890a13c73ac16d6fb042193c0f38133b3994daa2f039d
font_02_sfnt_off000133b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1