Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14825d9a3f5e3ca…

MALICIOUS

PDF

111.1 KB Created: 2021-07-19 17:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 412d14f12b4530cf07c961633024c8b4 SHA-1: d39b33e707d5a724e15e8a2a0502136eee0e21f8 SHA-256: d14825d9a3f5e3ca077d6ad09ba1049c7bbb63a88dd4c6a0284ae92983efd995
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to WordPress upload directories on various domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160710c395e47d---ropopamesuvekelukoz.pdf In PDF document text
    • http://toanthinh.vn/webroot/img/files/tiseguviz.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/domin.pdfIn PDF document text
    • http://vo23.ru/upload/file/gabikezagijora.pdfIn PDF document text
    • http://npas.ru/pic/file/61060520947.pdfIn PDF document text
    • http://pattonbrayboy.com/clients/8/84/8444fd18e659e4cf0f5d78ff5dcadce3/File/lisikitexu.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/64190056395.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc6c630e5f---mifenujawovuxapobiv.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d283e5364---datafosunonimulogunujij.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16085d70f94079---vimulob.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/c03pv071ag7e4nfdenuq3v1314/47665914618.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/vezivubozaku.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/zuginisaparilajo.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/29670246046.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1oel05gcgc3ee2t01kt5fjbbp8/viximagawufe.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/574539211e443b63351e57bc051cc9f2/64272198363.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/50918845848.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/15529197645.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/5917239392.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/subuzu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/ridisorolobubojanibuba.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/40677231114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=quantitative+research+topic+about+abm+strandPDF 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_off0001508f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508F 17092 bytes
SHA-256: 63de8e4dc4427a620484d876008bfbea54efb2bb902b4831dd2ca50f35c3005e
font_01_sfnt_off00017d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19554 11096 bytes
SHA-256: b249ff9f74d95d395976f0d51d055f80498ac5ea3007c102b4dc0505fbef8843

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