Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3a5d94e8f13117…

MALICIOUS

PDF

83.1 KB Created: 2021-08-23 14:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b0ec803b0e00007216990a64e24c606 SHA-1: aecc2c3185e245b71c32a8b715f7c44c032750a1 SHA-256: 9c3a5d94e8f13117f6ff6841a768ba642c8843ddb41bb4b18df607361fa6c26c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, some hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses time-sensitive language to prompt user interaction. While no scripts were explicitly extracted, the presence of numerous suspicious URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=first+aid+for+tongue+bite PDF link annotation
    • http://vwtint.com/userData/board/file/fevesakose.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/37651357075.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ede46c959a---4683020111.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb53c48cb9---xeguwokita.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76cbd38b2---gofatosewofewelevutavufet.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/pegaxurogorusowegalolas.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b79b3ab5---xufeviwetufodopasijurezup.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/bututolagozebuxasu.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/35673252580.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/826cde463a95ab57e25a6aab13fb2791/1773623661.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/95033277057.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210817162102_96518173.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1d55058b---17395925995.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8c4a71d24863cea6eaff68bb6c265d6/nawarewegetatarofamigi.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/54210056176.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be45ab67608---81525893656.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983603baa03---16308545284.pdfIn PDF document text
    • http://eternaseguros.net/files/files/xuwepumojudikorapifug.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771a3b8a22c---wonufokaje.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/89483392139.pdfIn PDF document text
    • http://ipceurope.com/assets/file/ribakirizizebowanur.pdfIn PDF document text
    • http://kccmaul.com/files/files/71111341052.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nitupabosevevodo.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/navazozusupifanizig.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b589eb10b86---nafidip.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_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 16496 bytes
SHA-256: 18db5113e017ef5ccdb20946b2f0e635e02e130156944ec9d7644defec128f07
font_01_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 10700 bytes
SHA-256: 9c4de50399fc4af1d862277ad9a2254bac27738454a29684ea0867a61651bad9

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