Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b9eb3e768138d4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 12:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 139a72a87a1758b40a62a2fdb9174714 SHA-1: 9f72b9c71739761d663945db0f12e18fc8a9e34a SHA-256: 24b9eb3e768138d4104fe7baf8c933da732928d78b399b2dd1c289628f8b090e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.gpe-el.pro/ckfinder/userfiles/files/81251911447.pdf In PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/4090376821.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/8056210355.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/72730121219.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/78805797964.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/fazepexasi.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/161573006.pdfIn PDF document text
    • http://topp.pl/_topp/file/28223099114.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/08/file/20210908_135158_181.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/gerononidiwobowujebep.pdfIn PDF document text
    • http://balone.net/_upload/file///wizoramesudamenive.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/49868929317.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e89eca18---ganoviwubejatamagopiro.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19ca69dbd---26904763552.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/27035254292.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/94d292c049c1194dad00f40cb01fdf95/petibexomipivobovalijef.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613048cad3f26---39192699688.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///xasizadisojotuxuj.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/76865865108.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/56627071666.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/92977516708.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2fe99996---35323374376.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/19779414809.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/32107713811.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/42953516288.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/mutosaraxekaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lines+of+latitude+and+longitude+are+measured+in+whatPDF 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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 17396 bytes
SHA-256: 4b837ceb4411f8f3ca8a22345dd91ed7aded0f8c4e2baee862398d592406240d
font_01_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 10944 bytes
SHA-256: 8ceecea5de3103b5596eba009b252694592b15a24d9ba506948f809ce28fb6d0
font_02_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1