Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd13627ebb78d57…

MALICIOUS

PDF

64.9 KB Created: 2021-06-23 05:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 81c9a0c8742d5676000c728b0c929390 SHA-1: 96f9bf711f71288691b11034edb4c61e69f4e574 SHA-256: ebd13627ebb78d5755862a5c4b283e4b7c94a0d671a3a0e06741a18e7d3acb41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jnnycc.org/userfiles/file/33182254997.pdf In PDF document text
    • http://zulassungsservice4you.de/bilder/file/30326173021.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/sagebegulemopuxekenituf.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607231133adf1---zefuxow.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/842ffb7113783b63a44ce3da22557273/1494529607.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/dea3e8af55f4b269e5f85696a9e2b8e2/86558971169.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/18753660416.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c8c0f770675b4954649c120b369554fa/88949971597.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076322dd1326---96151941797.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160837c682d1e4---51050222801.pdfIn PDF document text
    • http://unseretochter.com/images/file/89967261402.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f32878820059431aaa7848bb86b2e61d/kujofotezupe.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/89e2c8ed05150a5e89ff935ba9904362/43024776994.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/tokepelira.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/lapil.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1db1ed96---kojuwokokupevijev.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d360eadf517c493897d9f2d09f2091ba/pugexowu.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/29856553960.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fractions+cm2+exercices+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED5 5424 bytes
SHA-256: cd80074466e04367d2fa179f26cdb0f7f2392fb8190861818098e1a137e930f0
font_01_sfnt_off0000d13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13B 11832 bytes
SHA-256: 589909256d59da3233516028761f1375547071e937d8525dcee1eec1c841c783