Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03c98b1357f41ec…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 04:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e578281b6921ebdaff0e66f2ad4c329 SHA-1: 5b79645971fc085ac746d5b0b7d07826325837af SHA-256: d03c98b1357f41ecd5430b235f8831c7d08f1fa894bcb3d9c4a5230c4be2a86d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including one pointing to 'drafthe.ru' with a 'utm_term' parameter suggesting a tracking or lure mechanism, strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and URL distribution point to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://drafthe.ru/uplcv?utm_term=app+to+switch+off+phone PDF link annotation
    • http://demenagements-remond.fr/userfiles/file/20210916060825.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/29662054813.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/wilewujovafu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ff37505b---tedegotofi.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/68723836015.pdfIn PDF document text
    • http://beta-rc.com/upload/files/59128839702.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/3429025065.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/jajonu.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/97558229779.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/63708174212.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0752c6c5---93855635180.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/worafozonef.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/33328373122.pdfIn PDF document text
    • http://poorclarescork.ie/images/xabaxorupip.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/63636273193.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/70198861342.pdfIn PDF document text
    • http://masonhn.com/d/files/fuxuga.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/pubudanagupawin.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/morimododatuben.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/duriguta.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613850d10b98c---35027788253.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/d0d6ci2vh69hus43ls14fdkffo/robafuvusudin.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/70451608446.pdfIn PDF document text
    • https://tigaintan.com/contents/files/fomuxirafaradivuxibega.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/33897322038.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/55200001869.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_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 18328 bytes
SHA-256: fb30a22b37255c305461b0f7e7c43298997caac585fb042586e63572f8cea688
font_02_sfnt_off00012924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12924 10336 bytes
SHA-256: 9e4d8bfe6d66de5e45e4151346217a2c82dca2f637ede82bc680899a7076764c

Open this report in the interactive analyzer, or submit your own file for analysis.