Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dd89b459ed265d…

MALICIOUS

PDF

84.4 KB Created: 2021-07-15 21:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 35e6c7ff0e323e8fcec1a790d1527c78 SHA-1: fcfcbe597515024933588c9d74648dcee2793f4e SHA-256: b1dd89b459ed265dfaf6e70db6069652628ffd3083f29f98de538381401e7873
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious content. The numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of a client vulnerability to execute further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=gt5+codes+ps4 PDF link annotation
    • https://reaga.net/js/ckfinder/userfiles/files/88524662514.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/varigilanoninej.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/41673369574.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3fc0cbabc---kazizutuwuzazemoze.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/ab91e838976c271cdfa394402c85be10/gudekimurur.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ia1mhe4g4dcp7gcngass1miit2/kamifaraf.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/sagufaludoriw.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5b5bdb270---zozedi.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/disoxomojabuwoju.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/99572662074.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79726766a6d768eea27c17fd1dc6258e/pagakatofan.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b9543009---1230162963.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/42339757749.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060813112983.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/ludamitunukezub.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/dotepetupufe.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210714_DE4AC7BDCDB73393.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/ladigunukerumi.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/xukolu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b777f424c43---riniger.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1dd3b96912e3d83e25d500f3db3556c5/sozopuguburuminiz.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/faderaxunevukefisuteja.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210630042755.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_off0000e9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 10256 bytes
SHA-256: 7b4f416497effbf5d791db9b25d15e396444be03d1b69c3a8139dcf4ff6af199
font_01_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 17120 bytes
SHA-256: bb1328ff7bebd2976339aa52377b24db26444f37edd75aaf569cde65f3d11ff7
font_02_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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