Malicious PDF — malware analysis report

Static analysis result for SHA-256 b929a3ead897da4b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 05:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa65a2529d9ce7523f8bee74dd45d85b SHA-1: 34fc752703b91ec217591c26c5c275995ba79ffc SHA-256: b929a3ead897da4b40114d5c8466ba0f257f54610e97d08359be0d1a1f11cc88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which point to websites that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farm heuristics and compromised CMS upload links reinforces the malicious nature of the document's content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=how+to+update+kd+player+on+android+box PDF link annotation
    • https://lensmam.com/userfiles/file/74299112246.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/53732381285.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/meriwojorogosapanivedarit.pdfIn PDF document text
    • https://flomogroup.com/upload/files/renetufaremolaf.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/49273800634.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/koberumapenurira.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d758616f5c---vojalebekogofojawaba.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614322025b8f2---tutekinadipaludaterut.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5e1af89a73dd5539712e8973706c2149/poxavuzimigibukuzadamatax.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210914111202.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161413dcce9ca5---95439207243.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/u74ta5qa7fca63q7g3qvqm8791/defozaras.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/21728627118.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/ganugetuvibewikopazeb.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/milajagatuwomesogipe.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/24685481634.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/90661811768.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/teboxa.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161414d38a2ac4---1887111048.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/lifikugepilixomuj.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/53703278442.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/25922054582.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/wazapiw.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1ac1ae973016d0c531fb342351464760/27012289186.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_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 10840 bytes
SHA-256: 9177622c6b71873be6dcd5da9e183d0ba3dfdd4f465efad46eb821837239b75f
font_01_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 18796 bytes
SHA-256: cd4f568ed2abdb6df4bb1e502afcaa6d9670704ff413a22c8a8852f999b21208
font_02_sfnt_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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