Malicious PDF — malware analysis report

Static analysis result for SHA-256 302ba3644e3d91d9…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 20:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c3f98eb931c1f90e4f0f93d85f991b1 SHA-1: b25646c91d2afd3bc337213889ea82a88238d428 SHA-256: 302ba3644e3d91d9f4fe4dd2b05d30fc8b0fac9c311e7204f514b27d46d2302b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thuaphatlaihanoi.net/uploads/files/70177698977.pdf In PDF document text
    • http://firewheels.pe/userfiles/file/mivozepev.pdfIn PDF document text
    • https://servauto.fr/img/user/file/saziwenujinixi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a8c309336---gifewit.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/palonapivazarezu.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/bufeziwobakivenu.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/82312210953.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/mivalewijamawowezuvop.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135c23dc80d9---19646970047.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/mafeluzizalupab.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/40804868120.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/19422152911.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/42099902354.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/17170122416.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/44486406636.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161313d54be60d---zidiniravozelirepupo.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/zegudipa.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135f28e666be---betiwujunoxojo.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/goworom.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/50402650881.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/69096316062.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/sunejusegujux.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad52bb6f7d---69479864216.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/59837531732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+recover+deleted+photos+from+android+using+pcPDF 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_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 17580 bytes
SHA-256: 7969a03d860164025acf8728f8dff339763a5ae8eaef4eaff79f75b14350617f
font_02_sfnt_off000133df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DF 11312 bytes
SHA-256: 3f5548bffb8fb1bee2be9161dbb4ff491efe4c98953651839bb76b332fc860a1

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