Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da03904fafd460e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-06 21:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 74cd6308ba1d98cc9cbd43640013193e SHA-1: b78d7cbf6acba13e5176ae3ae1127c6148bd0869 SHA-256: 8da03904fafd460e532e8ac6852de08f8363fbc303ffcc159d5b8a0d9a1e1c62
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://sreema.org/FCKeditor/file/kipamajebitudisozefi.pdf In PDF document text
    • http://taiwan-tsai.com/upload/files/dadofum.pdfIn PDF document text
    • http://net-work.cz/data/file/kuwukiwor.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/8825391513.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/womegofokerawul.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hu5qpjaoaolfj7ltft0rnb12v3/44840039983.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f1b6fa6a---83008385589.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a9e29d581efa849e6d111a94bbba4a88/nezatoju.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/13299793970.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/80928982074.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/7508767929.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e79829afada---69578550185.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/47587298042.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/1sq1qj92h14n2moj67b8t7aav0/66518547674.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef325a5450---zijedetitejatoweretevew.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/e2qm9pm7gh5f070go0kt2dbm37/ginifowevijanom.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/kofozajeweravurexupilud.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/rezimudekatakawojegi.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ubntsa5md6r579ifbeed9s5a11/15224946755.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/54555318533.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/tuvunozesibuvowuvipome.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/53732007219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=olympiad+sample+papers+for+class+6+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_off0000b539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB539 16092 bytes
SHA-256: 76019eb02dbce588a51c57a372857d541cf2d090d5c563ba219d4776dc81c466
font_01_sfnt_off0000de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 10884 bytes
SHA-256: db3ce25631c3e7b58492cf0ccf30bcf1a8389d1332b5b0923b3b2e77b3e3e75a
font_02_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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