Malicious PDF — malware analysis report

Static analysis result for SHA-256 332865a783681f71…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 17:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39bf142b99fbdfea39b4fa0b23136673 SHA-1: 2bb4df2ee8c738a6390861507b940b67a0f21390 SHA-256: 332865a783681f718a14656a1d0043ddb924dcafd31503e1dc71c8af69f6f14f
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://chcial.ru/uplcv?utm_term=sophia+android+robot PDF link annotation
    • http://cablexconsulting.com/Upload/file/62389796850.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/nepiputajizixu.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/67651427525.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/bofelisebumojajup.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/tulonepavupixufajo.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/27063306898.pdfIn PDF document text
    • https://elemonbg.com/Files/File/21394523656.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/78837149100.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109012221146304.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/28189686801.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/43547093169.pdfIn PDF document text
    • http://charontrade.hu/data/file/8939875944.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/sureve.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/5425394867.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613743d190618---mepamijagit.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/serakavexuka.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/78886719447.pdfIn PDF document text
    • http://jucal.es/images/file/68346955081.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e651395aa---redutulagapugeg.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/gavufel.pdfIn PDF document text
    • https://taperagi.com/contents/files/93287160169.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/10845844398.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b63bceufpkro608p7r297cmsh1/bumakedademudizege.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/fefegitozijuwutaxuwaki.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/xevom.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136872522e60---jobejisa.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/ritabowefobaxidotokidisiz.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_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 18368 bytes
SHA-256: 9c13e3bf826e18e6f45ae3ba89fd41e4aba2ddb564c3ec9db65497e97510db2b
font_01_sfnt_off0001139b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 10356 bytes
SHA-256: d1b92d2fb20aabe1506634d68b97263a0f05e8cbda0426551a1d2578de0e6faf
font_02_sfnt_off00012ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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