Malicious PDF — malware analysis report

Static analysis result for SHA-256 9258530a540eb86c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 13:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b87c9eadb45d214688e655f288b7bbb8 SHA-1: cd80580899b2e4ffa16b9f817be23945fd5d75f5 SHA-256: 9258530a540eb86c006a626f26b283f1c50deb29d52b38df817786bc5629fc78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca87647b52---73300546935.pdf In PDF document text
    • http://finadev-groupe.com/userfiles/file/35034543386.pdfIn PDF document text
    • http://svx.su/ffile/file/2687445832.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/56749860639.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/51929160330.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/513466024e030acf8afddab3939d9538/xaditovotijozu.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/41029371451.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/55270914743.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/nolodobogu.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/jisewigasuwaxezububinel.pdfIn PDF document text
    • http://btfa.tw/upload/files/bezidi.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/33282538288.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/delazeruz.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/mudisofuwurep.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/nezefonanupinowub.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/novufomasanu.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/57257638361.pdfIn PDF document text
    • http://full814.com/upload/files/13812424158.pdfIn PDF document text
    • http://aeu.pretty-match.com/upload/files/7815630118.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/zefotodititib.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/jenivagawora.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137290caafc6---wudamarilagumafasujad.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/wixoxeleleruxivisetorusi.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210915_211516.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/nezoboduzozaxovozogeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=yugioh+duel+links+mod+unlock+all+cardsPDF link annotation
    • https://easyown.ddproperty.com/datas/files/suvaw.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_off0000b18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18D 10896 bytes
SHA-256: 83bc2d0c86f6d0a0a5c246cccd525329cfc1e3a828c977896ae7ab40b7bfdfd8
font_01_sfnt_off0000ca46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA46 16284 bytes
SHA-256: 60c5f127bf6fb97dc25936d8f56af6872cdf9e752c9ecaad06a6c51824078347
font_02_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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