Malicious PDF — malware analysis report

Static analysis result for SHA-256 8358a066e201aff7…

MALICIOUS

PDF

91.8 KB Created: 2021-07-20 22:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bf93abc9e347a4adf1f4a5c4bbf120c6 SHA-1: ce682e0534a4f6a360af28f5cb411e324a756447 SHA-256: 8358a066e201aff7d3b45aa92397ca400e5ca4bf6ce3a5f4f3400be4637364fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d6662240---binexasinovoba.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8b17e820---votamuwakapiz.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/demekidu.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/50611863217.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/76c23b3e8124331a72befec5f45bac05/79817211896.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/wadelomuvumuzafanurale.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92555f385---19736715108.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/0ea86dcb3cdb8dbf08ae2390d99ab0d3/98441656632.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/2fe0f0d795f0d27518da372021e2b2f1/puxigonenanuvemodixijo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb913f95b---1427260541.pdfIn PDF document text
    • https://deepex.hu/hirek/files/45836472207.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/469e594a3e5b43321120cf491d3ae342/26953667703.pdfIn PDF document text
    • https://akemi.ro/hirek/file/noxojidozevipipotewex.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc2e05bad1---nojeluge.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/26ed4c35136e6e4fd6b258f21e7b9ebe/nevawelukujonovimemedumo.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/73950370233.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qeq6ued21or9pugdspa1nl98bi/81600869007.pdfIn PDF document text
    • http://consade.com/userfiles/file/kidemaze.pdfIn PDF document text
    • http://kag.fr/userfiles/file/72548396393.pdfIn PDF document text
    • http://vo23.ru/upload/file/59897892721.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1bdceedcff114eca1cdc751f0fe25112/13886375902.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/80128833730.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/q1kr3ol7qb7pqpcbtsgd5l9lml/besizojitemefepeninafij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=testing+for+schoolsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf03158b4---fugetepalereludakobub.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_off00010346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 18052 bytes
SHA-256: ef86377eaff6ae7c4050cfd93b6e6e4b1d5d2db3ac8d89bd4157cded356ed26a
font_01_sfnt_off000132b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B7 10416 bytes
SHA-256: ea98570a9875a27d8398feddb7454fc377fe72c74415b023a6761c4579bd628e
font_02_sfnt_off00014a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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