Malicious PDF — malware analysis report

Static analysis result for SHA-256 2801ccb0ff3a61f7…

MALICIOUS

PDF

120.6 KB Created: 2021-07-22 22:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61fc0a7b3acb2da8fa9d94050961119c SHA-1: 86b12464a849a27456ee16c474d776c70a00e06a SHA-256: 2801ccb0ff3a61f77421f6726c6458873a3a52e94516481928ff07f7d2bd8b61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature, with the embedded JavaScript likely responsible for redirecting users to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608559f83cd65---57301986942.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848009e35f6---80137406066.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/baa9aefdea447f74d38aacce79f718f6/pejokiluwofabefubax.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/zusapexoketoj.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ira1up04126num9ts1028a98k6/sujazutozunotafiloxilabaw.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ddt6dp9gil614a8t1mjd62rqmf/lewiliketufukosadem.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/58473584692.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/62162084047.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021043010282273499.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd0773d1da---75877813464.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/g3a5fheticncs34i4iaitslokk/zotutexosilivata.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ceba3c68be1790ffade76c52f3b30cf3/79144729040.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///42383250600.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b155c639e1c107f88ed7e9bb467cf241/xewudaxebexuriretemerive.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ad344eef9aeb20463dcd7870720e636a/75391009910.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a500935f041---70500430847.pdfIn PDF document text
    • http://nprofit.hk/userfiles/90994240277.pdfIn PDF document text
    • http://soportedevida.mx/ckfinder/userfiles/files/sewes.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a21a9950---74657419032.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/7468535877.pdfIn PDF document text
    • http://amandamaitland.com/images/file/jakerewol.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aad0880682f---lawilofotadasokigosaturex.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ec858d9ffa7f05377ffea5f958cc7c4a/84014104336.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/80868592037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+1st+punic+warPDF 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_off0001769f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1769F 10508 bytes
SHA-256: cb1a466b194482e6902e5c5344ba56620fe12cc7317ff744b0422a3f00f921a9
font_01_sfnt_off00018ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6B2 17816 bytes
SHA-256: 414910045653f0bad9ecd3e4da7761a2278d95c1c1d85c8683bd33636df3486f

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