Malicious PDF — malware analysis report

Static analysis result for SHA-256 30938143426fe3a6…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 21:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b50f2ea7fdd48d44add75ed0326ccf11 SHA-1: ac4db0c0f54aaa16b06fc15c8c10c4af6a07becf SHA-256: 30938143426fe3a6820419a95f44864632fb77d068acae05e426331f6b866313
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JAVASCRIPT heuristic, which is a common technique for executing malicious code within documents. This script likely attempts to redirect the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings. The URLs point to compromised websites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://samuiluxurytravel.com/Uploads/file/89403341092.pdf In PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/58942540174.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/38234625116.pdfIn PDF document text
    • http://poiskvod.ru/images/file/45864656140.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/wukizugijudoz.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a61ea9d501e103f2613641866314f790/61614962567.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/27101035308.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/rumeduzefipanuse.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/96553948743.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec98212dbc---95974264177.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/duxuzanasuboluxikawijed.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/89232888850.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2bdcbf686---54022123222.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/rosaduxujepak.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/90598694827.pdfIn PDF document text
    • http://briztravel.com/upload/files/rubikelusiwus.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/85853066184.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/54196942443.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/tuwofufapilatewibopovu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210910143413662.pdfIn PDF document text
    • https://samowar.me/upload/file/dofejodefutosu.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/pakuzibapifazev.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210907003854.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/45958203592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=zettili+quantum+mechanics+solutions+pdfPDF 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_off0000b883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 10992 bytes
SHA-256: 08679bfa9d41e26b7b61bc81234ed47d67a159661b3b7fd13987e59f665fdaed
font_02_sfnt_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 16728 bytes
SHA-256: 49287a824f9a1c25810db2273c15820e8aa378fc25a5e26b9d1247b8b6fa6f7d

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