Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d2905c4e865da9…

MALICIOUS

PDF

83.0 KB Created: 2021-07-16 02:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 132aa468093fdfb54a1741797d3a5fee SHA-1: 6274a8ea4d08e9a9c2e74470abb20176c0448b10 SHA-256: 36d2905c4e865da9a35ff3fa06ad21bdbdbeb8cd63111c3fd35384284bd4ca9a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts hosting PDF files via form upload plugins suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a218fe7291b---zajulabevudokiwabifoxir.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160911e6fd2df0---58799769104.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0b1f221f---nufuzip.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/tetetepepipomibaj.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/30810072673.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5e0fdtp2hfehcqhv5o2d9oi7fe/8784052016.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/882c404abcb48ca676bf43839b8766bf/96695809975.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/71135693255.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/097f539234600865c205bd4961f75aa6/15599237536.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/27922762572.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/nojusisilukotitekowe.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5b209bc9c685e58ce8fb73fceafacbb5/83143017337.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/taxolizerunisadevukukokur.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/mmkps35duo826fibnv9e2ukqim/nefufonubi.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/31439732f000121ec3c036e2014afbcf/turofilejodusanosigavuvol.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/paim12cnb51ebbb55cppfkrleg/12235716783.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/naruvojebepepuz.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/19201017946.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/53753496890.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xuwuxadosaz.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607830e4134be---pawoxifikadobaz.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/vidadomegi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607661d687758---61584797800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=i+was+and+i+were+differencePDF 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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 10240 bytes
SHA-256: 2ee649d1df0b3ec261761004e8c9f6f64095802ff494e7ec6bd94f7aa5f4a0ec
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 17016 bytes
SHA-256: 738a45c4a5082d7a0ede8253619f0c1962432fb9e06498a62a97ff132f3399ae
font_02_sfnt_off0001256e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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