Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d9561b76fec8c5…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 10:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cd3f6457267b93e6f88410e674a54485 SHA-1: 7a366dba7bfb137f0e26bb2634201ff9a6ee1dad SHA-256: d6d9561b76fec8c59ab7f66716ecb7511cc3916f5a57258c9f9b9d5060828835
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hublihorse.com/uploads/userfiles/files/91342555303.pdf In PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/nogodiwop.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/93200083582.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/92361733883.pdfIn PDF document text
    • http://chikatere.com/Upload/files/35530506339.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/78833792914.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/nezewilekemimuvijuzibutu.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914005612278918.pdfIn PDF document text
    • http://warehousetraining.ie/images/52282116919.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/72567298618.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a865e1a60---86294654993.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/mawiniruvube.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/95758051813.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/mofadazofit.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/pafaziwavavok.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/5917993396.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5f9d5bfb969bf2f3f39e68118d1ca11d/75752644372.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/panevogu.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/33382928644.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-8/20210908085521971286.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365a4248a80---53761601210.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/vepipadolonas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=watch+tyson+v+jones+online+freePDF 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_off0000b0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F3 10736 bytes
SHA-256: 2b3c9032bfbf00687ac75b1f5a4bf5218bd60354d233d1f692bb350f4089b8a4
font_01_sfnt_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 16164 bytes
SHA-256: 75cd2fabc037ad7d0d11e79b90edca69a8d87294935df9dd3281b87010fd177d
font_02_sfnt_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1