Malicious PDF — malware analysis report

Static analysis result for SHA-256 b347e3084b598ce1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 03:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e6be5d6d490eccf7471d9bc51ca05704 SHA-1: 4f543dbde4c6a46558583e3949e5108bb4d141aa SHA-256: b347e3084b598ce1517fb5ae29e0dce5e9340bdecf90104bfdcf7d361731a301
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b48405d9f21---42730621893.pdf In PDF document text
    • http://21cedu.com/pds/userfiles/files/sibijigememimanijavoreguf.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/41509503776.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430083738985596.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ee42f35cb---lubiduruximokuxobenumotu.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/74761103493.pdfIn PDF document text
    • https://laser123.com/geektic/files/refepozalowegamuvafe.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf19727c0---35695558023.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/991184783.pdfIn PDF document text
    • http://podarox.ru/public/files/39660259319.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/45aab8afcb7fd8b57a2f0c5c90841e51/zadaxumilepakope.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d59858877---48697179919.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160973944d69b9---50985623154.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/68424341812.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/ranasamitekezanotoges.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c70e2b3fb---90849183013.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/25392675897.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/56082587793.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f215efd7545a1fe18ed511275c94007e/9400802467.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/4749456444.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9bcc56d61---pewawuter.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/43406795829.pdfIn PDF document text
    • https://ivaco.it/file/35257316074.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japuraxuxatududofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=contaminacion+ambiental+tipos+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_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 10852 bytes
SHA-256: 75450144f83aad9068e0fb1a5865e8a8c210e5402f38d657e206e9048246d4fb
font_01_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 18680 bytes
SHA-256: 7685f59d9f141f1a5bb727235d82afb19d047d145d9d3026a82c678e18b78a90
font_02_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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