Malicious PDF — malware analysis report

Static analysis result for SHA-256 397ade6f96232c5f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 15:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d955857bc4ab1ba986118800d2c66159 SHA-1: 0df7f528e360937be19e9600ea8f0da574d95318 SHA-256: 397ade6f96232c5f31e1ee1d2e17ed3898acfd37574de6c481634be8dd38de8f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://archism.ru/uplcv?utm_term=4+letters+words+starting+with+r PDF link annotation
    • https://fisheaglesafaris.net/pics/user/file/mixezelilududobakemunawof.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/57095125534.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/jupevubapelexokolusa.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/22962107870.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/10034280926.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/doguvelegazepiwigepir.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/65337172830.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/sevakoboxujamixukemegise.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///33582287112.pdfIn PDF document text
    • http://topp.pl/_topp/file/punafaluxorudibu.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/jugofokusutogoxatoragibi.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/vavorewirikizafokoxi.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/35780513767.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/36327244695.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/71945604921.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/p8s176svi75po2tnioq3r52947/guminenanusipoxozujo.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/87758892060.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182957c653---80759205009.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/navulegibux.pdfIn PDF document text
    • http://mutitar.com/user_img/files/batubemezi.pdfIn PDF document text
    • http://lachina.cn/upload/file/ganonaxemobesim.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f897dd752---76700540448.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/47345658708.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/10177093080.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_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 10596 bytes
SHA-256: bf53c8126d43593509cd4a16f6756d26b8d14bf7363ed056724dba8ad82f147f
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 18716 bytes
SHA-256: c4b894a9c52ef8be4f8fa6cd93acb8feb73edc9faba4174948b3a5685a422d02
font_02_sfnt_off00012127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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