Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f803081e461bcb…

MALICIOUS

PDF

97.8 KB Created: 2021-09-16 13:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e121e0625f7f7a52ca5578e03a76ef0 SHA-1: c0fa062dacc733e58c023cc4bf4d64217b9695d3 SHA-256: 22f803081e461bcbaa0a50fe7b1ccc15fd01951e6ec99c351f940e9971272caf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=aladdin+2019+full+movie+online PDF link annotation
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161330e90decf4---kenovosigumamulisatifabuk.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109120912065688.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/39335758987.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/gefogofagoberoset.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66292947873.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/momekabosuxipofuma.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/42917292102.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/27866843318.pdfIn PDF document text
    • https://premiersuli.hu/files/files/xudasimodur.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/55127221650.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/wefagasovegizelazojibolit.pdfIn PDF document text
    • https://tigaintan.com/contents/files/lutipebesuviw.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/10553894899.pdfIn PDF document text
    • http://egitara.com/upfiles/files/fanunefit.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26081c47f---wolifalopetemexul.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/29974492470.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8132c2d5---35207511565.pdfIn PDF document text
    • http://nineslash.com/user_file/file/tubovuf.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/fedewasizixebibovewevaku.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/jafisis.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/32415719665.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/35773933081.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/lepawibajoteke.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/rutajedimikigirejavuduj.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/soriwadixokej.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_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 10760 bytes
SHA-256: 28ee0d9d0ff5d2fc6f82eafe251081acd10d3cab819869577522fbcea02098eb
font_01_sfnt_off000127c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C4 22772 bytes
SHA-256: 23dcb4722f7bbeea0e8120048a64eafda14d920496db420422cc4c7eeedb2226
font_02_sfnt_off000160dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.