Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e431d4d22b0df9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 01:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f05c809bae702c356407a04a31eca559 SHA-1: 5b7bb20f0eed108eeaea6904320d2aea3cdac2f4 SHA-256: 97e431d4d22b0df95843eaf96f7e778e61acc8de589455334def96274972f5d0
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/34e00275c49c0cbdf54aa7d0bfd4dba1/sodasop.pdf In PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/4d3ea72b6cf4a165589f2f6fee8d146f/sexilesidovazuselubefela.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a3bd1c19d86167edf11a29b49757e32c/25765133760.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d43d3e660---78487099866.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5438abb911---14867491980.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/vefutigu.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/46043806879.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ed9b8bfd6---donomeluj.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/wizizirazolazitofujebuke.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093ddd9254b5---53352838474.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b58d690c744---75640717845.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/namudesobo.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/51917369572.pdfIn PDF document text
    • http://net-marketing.hu/images/files/7573901219.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/raduwo.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/kezagalob.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/66136659524.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/etrdvq20kqq2s6vfhfuf82abag/wawere.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/47950019264.pdfIn PDF document text
    • http://land89.com/ckupload/files/fuligosikaratefugakik.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/stqvbjste2i30fgu8riao8egeg/kefakodarifaledamo.pdfIn PDF document text
    • http://fitviewer.biz/files/file/83638118278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cbse+registration+form+for+class+11+pdfPDF 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_off0000d391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 18296 bytes
SHA-256: ebe51e6b7cdab4c7f4f5aa9138652d22db991699a4f055a32479728be6acd5cc
font_02_sfnt_off00011ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC7 11188 bytes
SHA-256: 5a87c0b3252a8d7982880d91d092649bb19aa7707723cd8853a7674eda7d6aea

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