Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17666090ea73266…

MALICIOUS

PDF

89.1 KB Created: 2021-09-22 11:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b66674e5fee51a36550a5f1d28640993 SHA-1: 76f92e071bc0b2873771a26bfa79853c10d628f6 SHA-256: a17666090ea73266182076c4a5e6fae150b81e5113a27620791ce2464aeabd23
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to external sites, many hosted on compromised or disposable domains, suggesting a link farm or redirection mechanism. Crucially, it includes a 'Clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique to trick users into running malicious commands, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://logistra.fr/ressource/site-image/files/fezupadozute.pdf In PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/rilulitexegakurugerojudit.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613707d5d6d31---banibirirurek.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210913002854.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/14c274aa5e2373fa80a3a2ddd73a2f62/66118220074.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/81658677809.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/m5m7e7iv3skmki1rouef3qlijj/xupazew.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630940859.pdfIn PDF document text
    • https://petek.biz/resimler/files/99754289316.pdfIn PDF document text
    • http://knipia.com/userfiles/file/rakiwele.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/14988431191.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202196205174115.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/78317495648.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/70251133228.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/806b6fa55ba787a76d0cfec5a5198de7/23167235440.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/mogemaluvisedatobuxuj.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/lokuxopujezubi.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/rudorokirofopa.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/vavexatozevovemom.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/01/1165614748.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/76742940953.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fc90a945fd8fb65c42961b0c1fa08115/81860299065.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/76700236423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=new+anaconda+environmentPDF 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_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 18284 bytes
SHA-256: d41a28dac49c95d11fa3e06933c266cd82e449900d3e77934a8c76cdc9821efe
font_02_sfnt_off00013ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBF 10444 bytes
SHA-256: 6c3d33519a7b7a91d8bb85ff600d40e9ec3b6a91bcd3376205ba8aaffb441f83

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