Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b830e0db5b879c…

MALICIOUS

PDF

90.7 KB Created: 2021-08-09 00:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae5a1c44df5b30ac74f287789f5d99d9 SHA-1: 7c1c6a0abefcd6af650331547253f9b47a6b418b SHA-256: b7b830e0db5b879c62b88f79c44e441ba67de9a676a894477eaaf5c2531ade95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters further support the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=letras+de+la+cancion+salta+salta+yanasita PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840697e61a5---volunedopizezekezi.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/57967502940.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/36429754202.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/th07t1opfcg208pmgelg3kklgs/lavexexil.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/xivinovibifi.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/69825958584.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a92412ec1---zukukopadusitalutik.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/el4nl6kv92nvh6g7rq77hc90mi/mugaxikusulovil.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2c899c4a7---gupetifolabekaluzezafile.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076ae01d914a---86754763627.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210731_D2B4C66075904FC4.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/49817053651.pdfIn PDF document text
    • http://teraval.cz/res/file/puzuvix.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eeb34787b---51649646658.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/pazoraj.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a8e2cfddc1a21d8efc3e1b48d8c33d9f/rowetoxenuto.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac26d43f410---23070152477.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/2a8urq6v17eicr1287svltb33a/63293318053.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/wawokerafebefugan.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/52419831153.pdfIn PDF document text
    • http://lalinpress.es/ckfinder/userfiles/files/67971761445.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745b0aeded7---19021963122.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_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 10432 bytes
SHA-256: f3b8faec1e91d5bcf60fe54d5f208e28cd6cb605040ca7336edbb64def19a718
font_01_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3B 18320 bytes
SHA-256: 3cc91ec950475009aed6f5d25d1a4864bde27921884f1cbc1dd64da005e05fee

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