Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e6a673cb84dda9…

MALICIOUS

PDF

71.4 KB Created: 2021-09-13 04:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c070e6dd88b1d850003b4ade687c69c4 SHA-1: 3481af635789b4f0297a59265d95d07838e1ee55 SHA-256: 94e6a673cb84dda9b67dc625f3f0ee10cab97b20ed6459514bd03d4b73308f94
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on compromised CMS uploads and disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and embedded links are consistent with a tactic to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://cructi.ru/uplcv?utm_term=10+free+ig+followers PDF link annotation
    • http://hitecds.com/userfiles/file/57614453431.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/wimupamipubadu.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e5a61930a---26178191668.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/wijipikelu.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/80009728566.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/86025191100.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d79b1076---lajivokenezolodapirox.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/pebokedomuwejomasofudus.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/71003479905.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af3f0acc2---84497351613.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/87836516812.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/64972538022.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/wifuvimasabijekupukuxojo.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-12/20210912074638578842.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/85186975855.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/lunimupetenuxipelev.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631020832_0d8fd5de75.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/5081370584.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/fonafepikat.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/besowikeje.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/gopusibakizojekomuka.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/wororiravuge.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/26796977018.pdfIn PDF document text
    • http://x-mobio.com/upload/files/96747392550.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109122120026895.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/zuwunibakiwonok.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22760517752.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_off0000b96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96B 10188 bytes
SHA-256: 319457912d237338d7c04616015baad10a5ff9638ce7efbfb95848d30fec431f
font_01_sfnt_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 15668 bytes
SHA-256: a5cf47e7aeab73388a216d88b74099b8fbb1d1fab4494ebd96bb47047a03f55a
font_02_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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