Malicious PDF — malware analysis report

Static analysis result for SHA-256 06bf51b2f415340c…

MALICIOUS

PDF

92.2 KB Created: 2021-07-04 19:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e1fa1d0c983712e2d21be1767c1cc985 SHA-1: 967ab3a1de33c197a914493c2b8f0cc38923d919 SHA-256: 06bf51b2f415340c8fddf27204bf204551ef19d4a269e11f86c8f6892002257f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document designed to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=goose+house+goose+house PDF link annotation
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c92d08264400ce8ac3447b8a943a43d7/mitofifomorinenajulajuraw.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ea858a89---94078162597.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8f1bc61e---3992225128.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607159a6a3e19---11738324251.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86f06a6d2---xumigi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9f5616e197eaa3b0cef1a02a50345cd6/32551977063.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ac0e5d844---ratawinolexigenawako.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/fomagoxeguginejitosevox.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16087c28280a53---42732867727.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/78139322146.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fedfc12bd1---fevatuzegida.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2fbf875b3aa16d4fd9b81ba52759513c/83322387220.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/gokezekexezisamulefi.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/f3d190917a023d1f3d027ce6a645468f/buxovaxaxufepuwuje.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926ad239466---15167573177.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/saxepovedibetuwewef.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210619005156_6htcwg.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/541a42803969ca62195eaae1c70dcc2f.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/wopekuruzejab.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160865a8115c55---88973006784.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/gatilisodadodovarajiderub.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833ccfc9ec7---53493018302.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/jeripuguwodukur.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_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 9924 bytes
SHA-256: a04d5dc398db97859bda4f233045b5cef4549fdf98855c6eb256b3f3b6976896
font_02_sfnt_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 17764 bytes
SHA-256: d0d6ccc9f42ddfa5162a94864d5ac5ab842df9cc6957f3ef1d3d4c271c2eb550

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