Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea48db91c40043c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 04:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac9450a320ead9631ae9198263003586 SHA-1: 18ca2bb7671897e302b9f635508e1b83e349d242 SHA-256: 8ea48db91c40043c756dfc989b8001ab0404be8b721ae9474ef936dfb8abe597
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The presence of multiple links pointing to compromised CMS uploads and disposable hosting suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to download further payloads.

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 http://munnarinfo.in/userfiles/file/66988565493.pdf In PDF document text
    • http://dytac.hk/userfiles/89397562924.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/9274563cd1367a9d72b36a7cc5bb86b9/56989868318.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4e5d717c---bovajosubegapisoweluji.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/18039047429.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/gadosuxepiwexab.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/sonubep.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/97kchsstd0irrog53bdtgb7ib5/12828840684.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/9404270187.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/rubolug.pdfIn PDF document text
    • http://someteme.com/archivos/_20210707155808.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/68099288101.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/zaxemaxebije.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/42450884469.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195dc3f53f---32046080010.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/jesabiditubufupave.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4d096e07c---wisabarumej.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/12986709965.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/5e9a126356e5b3ee61d77d08e365ee0a/xuzebuma.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085493a33b62---62749789685.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/miruxugejevovuxeribesu.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/23540621575.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/jojijowaw.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7c00a72fac0d732f4646edd39ae8baea/junizapiruwilow.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/ludukasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=durga+saptashati+mantra+pdf+downloadPDF link annotation
    • 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_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 20240 bytes
SHA-256: f809353cb9fce5ee52b3ef6a3ae301946c2bddbe3983d52a5713df15c9b7bde6
font_01_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 11000 bytes
SHA-256: dcb8d26e60a10d168bc9d9049a15e664dbb030f9889155664bf68e7febd0ac3b
font_02_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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