Malicious PDF — malware analysis report

Static analysis result for SHA-256 c075d17027acb388…

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 19:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 205ba9f770b4a96fac743157a96557fc SHA-1: 1d1374c610441040422a1b4709cc3f53e46657f8 SHA-256: c075d17027acb38875ffed285b896257f29392a0527ac61cc338421032f74f16
196 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social-engineering lure to prompt the user to install a browser extension or update. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to download and execute a second-stage payload, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://hasdeu.md/data/userfiles/files/gumezusapijuvon.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b528d5c254---70970829087.pdfIn PDF document text
    • http://cke.hk/userfiles/wezumarij.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/77118312123.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/27249774070.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/7fcff815c70b12ecaa047d422dd54d18/kudugerikipinakatobevo.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/tupozifodurigapiluleruge.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/27629833691.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/95741722244.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/palitixok.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/34e26fc029ab0228fbd7066486ca9db0/3472163440.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/leduzozutadavovorema.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0812f5fd7d675031d8aa346f7f5dcda8/9563588464.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/27638527590.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/66652396673.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd44f0cfae---39144063962.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0801c74485---43493370573.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/zovapufilinofovu.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/79094678660.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160982b23933f8---44789598376.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b33f4cc9f436ccec04cc1c9fddb114ba/lowebotovajito.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fd4bd5f7---sigebajapibizezubigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+see+who+has+viewed+your+instagramPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F4 14308 bytes
SHA-256: 15385690d77f1d866450e0a3d76ccc5136c5e2ae6fdb498bb68c099c05d279ad
font_01_sfnt_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 11004 bytes
SHA-256: cd675d702635ce08d4a74d57d08ba8ce46d41c8cdbeaa61d083cd1d3219d76df
font_02_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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