Malicious PDF — malware analysis report

Static analysis result for SHA-256 348683225b7e4d85…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 06:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4bd48b1d58019a212d0d917fac2477b SHA-1: 03b8dce73681ffe2de9ec3657fe1b4360f4661b0 SHA-256: 348683225b7e4d850f279d3978e2b8fd7088455ae390af1d3306665a4067ebf3
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the nature of the detection indicate an attempt to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609be7d9f0a7f---36295403637.pdf In PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-1/20210601085526337619.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/kutonitajorupasori.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a212d0c377a---denezisudolawobujoru.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/85353114518.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/wodopowepapapujepipifuza.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/gefazivajidofigumotow.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8b36addc7c3d410e7882b39879e40e1d/dadanefekekojexizin.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/mobogiwojujevumup.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/21805841478.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/bonibefixubazinelerinirox.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee6d1e1640---tofiv.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/potuliti.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ad063769---bivonemuritirakuxovam.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/gexekuvex.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/wosatowaxavinemok.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/91212344950.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ecf02eb836b82577205588a7bf5b21b2/97987414246.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/gobironaposaxazasazegiza.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/redikadefutogevuda.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/38a1e603de637e8744a4223614f2c141/tedojusifaburubiwudogek.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d5ccc7d2bc297d583368891fc61982ea/warozilefonu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095b10f45cc7---6469644725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=precalculus+with+limits+4th+edition+textbook+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_off0000cebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 18308 bytes
SHA-256: 4048066339a7ea05ef53367b29a93076a1ee5dfaa6b539db13b99522c6b32aeb
font_02_sfnt_off0001169c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 11484 bytes
SHA-256: ca9a713e4d32ea2be7bd840dd5c45f7a319b3cf8400b0bb8808d9ad5adaa85ff

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