Malicious PDF — malware analysis report

Static analysis result for SHA-256 299efd30a74808e4…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 09:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cbd12467f321806020e48c2f16c04ef7 SHA-1: 4cb052abc88cd0fc150663b68bb298fd48467ce1 SHA-256: 299efd30a74808e4b5998eac9694c78f9b8924eb4d130c6d1647bef0f07dbee6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farm patterns, indicating its primary purpose is to redirect users to potentially malicious websites. ClamAV detection and ML classification strongly suggest a malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=online+casino+malaysia+for+android PDF link annotation
    • http://vigova.com/Images_upload/files/tafikonomo.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-14/20210914141520220708.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/mesovedupanaragemaz.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/40116093172.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/5282271603.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/60891207825.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/79649188468.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/kiferekizunijor.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/39945956586.pdfIn PDF document text
    • https://doitoutdoorz.com/file/asckGFWsaZBFgvwc.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138422cee662---fabunuji.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/91078741688.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210905012329.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/71c26f263b167b724480e8b2d1ac6bc9/91390940123.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/40042477650.pdfIn PDF document text
    • https://afma.pt/site/upload/file/21426127096.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-10/20210910184500177207.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/79821632660.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/29684222133.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/titevukuwefitijupiv.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27dabf3f0---96515413580.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/pibepemalosilujefekalol.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/wigidumewujadag.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/sufajenusumarapojabizome.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_off0000b709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB709 15068 bytes
SHA-256: a2351160d3001f56c028a31950991897f86716d9b393d9236be97a0f41b84b25
font_01_sfnt_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 10680 bytes
SHA-256: 0ec0a39e8abf5a093314e526edbe3e6cc3ffe27a73101ecc4d6167a6901950f4