Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f615c7a3ed95cc…

MALICIOUS

PDF

80.8 KB Created: 2021-08-17 21:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cec4e7b216aecf266155e27d639ba1a1 SHA-1: 6190033adb51c96128d010aa0fc79b5f1b1e5df6 SHA-256: e8f615c7a3ed95cc25b00a8f45fe79614a83d71a5baeabc84ba04bb81e009449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URI heuristics and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kt5u1m2j8knrbmqts2nsufasks/15266562816.pdf In PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2megndsjal7llrb69u6sisdfc9/tazenor.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/67515510956.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/39877508812.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/pugigefizat.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/82854844875.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a45dd301f---72605003882.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad94d5b79---dupesisad.pdfIn PDF document text
    • http://polipack.ru/content/file/rosikafova.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/pejuzutoruragef.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/80467847428.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/rujijogekuponufimu.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/25343557707.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/56e7bcb8421dc0c295b16b64868e2a3b/97917180026.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b56473973---94703934260.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/80182559541.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/betesor.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/49457469211.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/bujanubajovotokak.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/61839866778.pdfIn PDF document text
    • https://webmenuplus.com/images/file/31802076787.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/32471090337.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/21136817627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=daily+use+english+sentences+with+hindi+meaning+pdf+free+downloadPDF 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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 11368 bytes
SHA-256: 31902521da782b717d1ae54f117eaecd698523b639d36648de241549f8cf6c68
font_01_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 16376 bytes
SHA-256: 119810dfed91818275bc65f43d619beb7767a63f1ce06e22b3839ea453ed1cb9
font_02_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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