Malicious PDF — malware analysis report

Static analysis result for SHA-256 41915d88cb41f1ea…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 14:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97203ff4295041d5ee58af4681c4ad3d SHA-1: e2bf7bdab1b4a2b9772a2245a3551c656703e72b SHA-256: 41915d88cb41f1ea2055c76005ce2980670b354cc302e6a5bd513c711231c5ee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, including one pointing to a raw IP address, indicating a likely attempt to redirect the user to malicious content. Heuristics suggest it functions as a link farm on disposable hosting, potentially for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=verbal+intelligence+test+questions+and+answers+pdf PDF link annotation
    • http://szyqjsj.com/UploadFile/file/20210917181631400.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e518b2f1---59776054371.pdfIn PDF document text
    • http://valeneighbors.com/userimages/wawigiwitinizuduxokosi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161363d54623b4---kobujinajid.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/nimufawir.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/69296566242.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/golidozejopile.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/wesexejisekukiveso.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/54716164949.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/fatanujuj.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/pudizovatu.pdfPDF link annotation
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d623761825---78791691534.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/3979744781.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbc804de3c---51299789010.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/25291301044.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/kusatepiweborarakiwa.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/g4q6sqigi2q84qi8llfsqq18b0/65903141955.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614472eacc105---67015516715.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/karabegud.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/makevozapebelumaxitewu.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/gutenawadudozop.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/86357405982.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3317047d66c49b3bb58c5c719f2634c5/nenikupilulasuzafozem.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/pimavajikinoraniji.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_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 11236 bytes
SHA-256: 5e1100aad7d7e00febe6e9b2c4305078a5e3b44fb6a61517e32d90f8a33a023f
font_02_sfnt_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 18576 bytes
SHA-256: ee9bd75573303a64d275ba82e820adcb49201fe94a3e496b14a082c18f5f8681

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