Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e4d7a82166e8b6…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 07:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a1b53f3abbcdb56420b9a719c816ed3 SHA-1: 025465aae39787e9143b95c88bfddebf9f7da437 SHA-256: a5e4d7a82166e8b6070ac3702433519f41b7083fb521abb646591d8299b5b2d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://synerhu.ru/uplcv?utm_term=game+android+coop PDF link annotation
    • http://elementsgogreen.com/userfiles/file/93637610525.pdfIn PDF document text
    • https://ms2oke.com/contents/files/18929282181.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/37220864719.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/tvqtmbviffkecurji4sr32hi1o/pebodiguf.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/17790772049.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210903012413_69lveo.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/xineravu.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/domud.pdfIn PDF document text
    • https://avenue102.com/uploads/file/99446792320.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/80085040307.pdfIn PDF document text
    • http://land89.com/ckupload/files/pikuvopofak.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/moperiwutikilitaxakud.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/57258729925.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/boluku.pdfIn PDF document text
    • https://actor-conseil.com/files/file/87514724922.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/25948633934.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc23016b1d---sitikekovuvaziwatifanuna.pdfIn PDF document text
    • http://napiarsaigh.com/images/lalefozi.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/tupimilizinidumupeze.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/6821479565.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c67b88ab8a---73145635176.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9968305e---xozowowakizofa.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/mepamijilasubuwexozo.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/busitidog.pdfIn PDF document text
    • 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_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 16564 bytes
SHA-256: e3d37e0ca97dd34b340e18ba297f95fa72d0cf45a028716ce5f6b402b4e2d3ad
font_02_sfnt_off000136cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CC 10400 bytes
SHA-256: 6286b2ae0b9f771001a41396555a1a4cbf7e2ee158f74a2e4f8859090662b7fe

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