Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab914259be6c344…

MALICIOUS

PDF

73.4 KB Created: 2021-07-30 14:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8193fd30153b3f41ebc54252a7681c9a SHA-1: 64b2a1dbeec7c85d209181c16e9181d4cb330f34 SHA-256: aab914259be6c3449e664a94eeb63c55de89ecd3ccb545b1ea5159f4c5ea109e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://partnermind.cz/images/files/feraxazidijosase.pdf In PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/96059652416.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/81b57d0646725860b794e1d2b1bde66f/91867803612.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/20368434890.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7b0e731f66c4ade2d5836e1277a50610/puwolugopo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc38163e4d---ruwinupajerexodirup.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hiegq9vmopjtkig3kcqs0tb3s6/68563122290.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/luzisumenajibud.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d0de75d7---82754832854.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ee4b87e27e0c245ec80944c00660dd2a/60472222944.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/23528765323.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099da20d07a2---21419265412.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a352a6db380e8ef7b554ba33b09328c5/50892552105.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/72149371733.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/48568438775.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/bulunavolopakop.pdfIn PDF document text
    • https://shidoremicrosys.com/media/vudotozutetalabetiruza.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/tmqh8anh9mf25bv8ugi45npu8e/vifeboxus.pdfIn PDF document text
    • https://dm288.com/slicice/file/sajodasido.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/75966542137.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160755d6cdb50f---64568240072.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210625181350.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/7471496157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=vieta+jumping+problemsPDF 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_off0000bc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC35 15808 bytes
SHA-256: d8d85bca837b6ffd32b4897a58ad37d36caa396320f0dde469309f751c1e284e
font_01_sfnt_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 10936 bytes
SHA-256: 22e3ea25487b7a9328d0e678f1235e6f96a5a8e4c3d190e7ead555d91dc2682b
font_02_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1