Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d670199d64027c5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 01:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a8b8257e53e058471378ca7372e8eaa SHA-1: e4fd495301e7a00f2267b4249303d056afc444c5 SHA-256: 5d670199d64027c5e56d2059e9cbe4b574c4d97fd613b1f676f3850e09d7c70b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these compromised sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://fatamorgana.fr/uploads/assets/file/vibiwedewadulupevo.pdf In PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7118d878dc21929c69d4e6b91dfc9e0e/binid.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/85316813727.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c7828ed2---zalinixitukelekatibadupi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f342f1f3e6---pesawisax.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/viposotenuvekizijovipotaf.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/uotrmihcvb7t6tkdan78l79ms5/63278331689.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/pefex.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/75659198909.pdfIn PDF document text
    • http://uci.ir/userfiles/file/medubexutosunimov.pdfIn PDF document text
    • http://reichspfarrer.sk/file/27766344346.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202108151942408134.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/parafibaxezalakezigi.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/38833dnll2j53qo4kjb857n7jg/22307079203.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/80517878251.pdfIn PDF document text
    • http://beateromer.com/bilder/file/biraperedofepemonufo.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/mejelitexulekawelosufu.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/4587674809.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/f39bp5aja2ogsjfdmbj893ugc9/50542509803.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffa7d22c01---ketutixegowudodebumu.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/42638661473.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/43400364598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pneumatic+valve+symbols+drawings+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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 17588 bytes
SHA-256: 01aa05334ccca7a8f4eea594a8e64505da9b5c805998c86f02564b7d421c7022
font_01_sfnt_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 11468 bytes
SHA-256: e6b5fbd6c8b3c43ab7970914c6e9b6ecb807cc42d8a2999ea8dc80c16ca08696
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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