Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45feac2e5496c3c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-12 12:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4188e14eec5d3568a63aa36cf1918b34 SHA-1: 7bbbfa6f20aa038973d4c5ce111fa6cca6702977 SHA-256: e45feac2e5496c3c351edfa69f2b1bbeb5ac014d6aa0496ec116c79bdabef168
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised websites or disposable hosting, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=free+download+game+pc+offline+windows+7+full+version PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14aa1fe99---vekijomarejanebode.pdfIn PDF document text
    • https://auto826.com/uploads/files/64880799936.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/xitawodurefasulawokofov.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/18942056443.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/81856747180.pdfIn PDF document text
    • http://cloverdiamond.com/file/tifokunekawezuloxu.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/87222675881.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/af315ea43a44e6513add6af2d4c967c9/mimabopixalizuti.pdfIn PDF document text
    • https://mar3ol.com/Files/files/momemofafokulel.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210906203112.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613959e448066---bazazivaka.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/rezeraje.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/xarixoxebutekiradatoto.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021090716310157269.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f731e1e8e1---zivilifupazibo.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/rawubobijulipo.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/18933557678.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/56658249092.pdfIn PDF document text
    • http://coachhouse.info/assets/file/ropilegulat.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132291e66689---90982239945.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zunujixusovonuke.pdfIn PDF document text
    • http://e-sportis.com/images/upload/55939797724.pdfIn PDF document text
    • https://adikmanis.com/contents/files/29032178253.pdfIn PDF document text
    • https://designclarf.it/file/gulifivege.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210906/16309423136621.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_off0000b624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB624 15172 bytes
SHA-256: 3b62e2f117b1267d2ed6bba6d4bc01868f36aa191d3a66defeb3102307c70070
font_01_sfnt_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 11144 bytes
SHA-256: 4525b412e1c2b81dedef3544a8a9b4e701c05e3c1cb5bf49cae4c8fc8efa942b
font_02_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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