Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1952bf57eb5ce8…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 02:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b689eac4092a5f85ada22ab0f784fb5f SHA-1: 018281b88f1dd12ef1a6396f04099c27e0878414 SHA-256: 9b1952bf57eb5ce8b247f4505e2f3552c8b4e2883cad0549175ac65fa12f6e1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to trick users into downloading further malicious content. The presence of multiple external URIs and a link farm structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/i1o639g3lqflvn4csus6rlgsb4/lifonogavumodifolodaz.pdf In PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/36684650207.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/71930177857.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/xesifarime.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/mirugisinijawuxabesemewev.pdfIn PDF document text
    • https://dyaa.club/uploads/file/nuselifalafanum.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399393091b2---51260378092.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/fajejemezovoxeti.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/fijapamisoxigizev.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/98736580846.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/rokiwixobodobofavaxe.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/besarotamelatuba.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/jarosutixupaxid.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a3213fa6f---22954964205.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/kavajisetorepixiwuzujan.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/46325193125.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/9322876680.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/89097317777.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613753f60a11f---49666992430.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/jelidifalivosime.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/nikibelojiwogawunaxalotu.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/gisuwanamotiv.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/bixunev.pdfIn PDF document text
    • http://mextro.de/upload/files/lomamafud.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/bifezeseleriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bt+notification+apk+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_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 16908 bytes
SHA-256: d31a7206b792a7601bfdc4a63f605cc1635ae4a7c6b905e0249e4d7e3e145ba3
font_01_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 10444 bytes
SHA-256: 5d85056fa86fa3dafc79d257268cf5e3091071039f67555c4585f6980467abb4
font_02_sfnt_off000110ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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