Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bcacc85a437ad2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 22:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a9d13c9cd19871ff6b4000009a80eb0 SHA-1: 8f69bd61ac25f2de7d7dd0ecaaebd7f04b4b6891 SHA-256: 15bcacc85a437ad21ec297fab2f31d8ff505e5bad4e6fb53ed88aa5333ddb1ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=meaning+of+the+curriculum PDF link annotation
    • http://iltorg.ru/upload/file/rilosunenerulolasolizixir.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/ripox.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/komajopudalodize.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/86582041124.pdfIn PDF document text
    • https://geniodelweb.com/file/fotaruwodidedi.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/pawixovufasoluxulixapago.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/wujilulinogud.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/tuluge.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161442839a6eba---zafex.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/37e57528b22efa5c548b58816b67f229/31229460786.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/k4n39q64oqqvm6bkvqb8pmqhiu/ruvifilejebasonefusikedi.pdfIn PDF document text
    • http://goref.ru/files/file/62384071180.pdfIn PDF document text
    • http://kdekdyjak.cz/data/41294583085.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/m0frm7ns4i671pkqo3kfag27ai/46093993921.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/zuzojerawatusariliruxoti.pdfIn PDF document text
    • https://nls.vn/upload/files/26390941741.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417afbab05a---98024109072.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/zewumulogoves.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210920_111934.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/lerudisuvuwe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/62111545628.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/38591816540.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/25628272887.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/javef.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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 10708 bytes
SHA-256: 11e6b516fa20ebc6a6912d149f6e66f5913e849dbefa992809f3993997063862
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 18608 bytes
SHA-256: 1c3d773fea38ef35103b41820ea14dd2bff47268fb8bfb2683c70033ea9ff752
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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