Malicious PDF — malware analysis report

Static analysis result for SHA-256 976d603fff0ef83e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 14:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 353150ec14b6463efc1fd922b88fd26b SHA-1: ce07151152fe731b9d35fa10c57c41d932a4b1f3 SHA-256: 976d603fff0ef83eb4262f1e954e331062d465715846994ef5d8abd6c0ef2fe0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript, while not fully decipherable, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=mobile+legends+bang+bang+game+play+online PDF link annotation
    • http://tt-ural.su/admin/ckfinder/userfiles/files/xobubilijas.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/vefawozebexelo.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210909204546.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/wozoxawilinejipodigebew.pdfIn PDF document text
    • http://airzo.net/userData/board/file/80577378361.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109021105375268.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/bofenazuforexosubal.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/5353513331.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/91419607304.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/vexaxuvupelek.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ab88f4f4---dewivodedor.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/24708844780.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/gukuz.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/belimejegureragubew.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/gavalaruvepaputosaton.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/wijitabegiropuxofu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3623f1d9d---49609650790.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9re5tnf1pq7m3du3cpffcrdge1/56365953388.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/jiremu.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/90175713250.pdfIn PDF document text
    • http://runhouchem.com/upload/files/ninariwixivo.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/63979713032.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/84768487100.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/69899415588.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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 10784 bytes
SHA-256: 072358d0aa278850e462afbc065338e06d702a77687a16371b4b25aafbd50294
font_01_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 17508 bytes
SHA-256: 22f71f693f7a7b56dd659394abb81de7343c622e0e228e58e0f28f3fe18b4e24
font_02_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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