Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f79352464348f3…

MALICIOUS

PDF

105.2 KB Created: 2021-07-13 23:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d7ad8c6c2c704f64a5017381804aafb1 SHA-1: 50225340fd34152a6309a25a3a84f1d3eab10690 SHA-256: 42f79352464348f300ca9d7b83fd7dbce55046b5a3b9b5538113da04040afec6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to compromised CMS uploads, suggests a link farm designed to distribute malware or facilitate phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=you+buy+we+fry+on+7+mile+and+gratiot PDF link annotation
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608480b61cc0a---15741033700.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c54b3485a4---59840955792.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/7f308bebd06b459c490697db41bd0a3d/28775545301.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/jofudifotufo.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/d02474bbf53fcba2c2b899083b2961f3/repibaxugekukukagi.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/48037854460.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/77385704138.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/66269105883.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcf48694f0---bixipolubax.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qg8t8qi374i6g5nq61de34oelk/54813022660.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/41819922605.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/kirawuwa.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b68c83a1ad706f8e286335aef811aa2/57499579866.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e63a98dbd356a4860e7a4ab2b421d9ca/85989843024.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fb0a57c15---gijazapi.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pudatifefamib.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a179d1edc---javepagevegalano.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/50685618202.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/55840543918.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_off0001353b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4D 18904 bytes
SHA-256: 58bc731627a2ff39c79ab2ac407582e018cb0c540da5d8c79e0f48a62e8da807
font_02_sfnt_off00017ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EA8 11004 bytes
SHA-256: e76805f61273a240235888df6ad84412268b1ba0f3cabb998c2d76b1c17c01ba

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