Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fe6d9ece5c5c4d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 18:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d3a876b14defff554e090b289af51999 SHA-1: 51674dbcd97629912fb94dfcede08819fc2a803f SHA-256: 70fe6d9ece5c5c4ddfc690e365e94f123fda39259a596dbdd60bd7b346d3d196
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The file also exhibits characteristics of a link farm, with numerous external URLs pointing to potentially compromised WordPress sites or other disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/k4vm77bgvq711idf6886s4faik/xizapixenukobuximox.pdf In PDF document text
    • http://kopdesign.nl/userfiles/file/kowukivugomitarulaxuso.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/67374694054.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/50665056338.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/2500882249.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/kopetametamafujuzifi.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/lijusewebikulaviwofojojav.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdd6d58e0---kumifosimenegaju.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/tipenawegifipesuvovuju.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/61856525987.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021081916383373499.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0352f13cb---92884504564.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16080895375ca4---warujob.pdfIn PDF document text
    • http://plncse.hu/php_data/file/45417236549.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/40009742624.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/fagubu.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/90296525541.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085350c1061d---manutexizi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf213df9f0---gotopop.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/pewiguluzemarazare.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/78927211127.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3768454f556c57e35a81e7d1c44e9e46/dojap.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210708_4B9AAF87FFF8A9FB.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=reino+do+bailundo+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_off0000d47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 19616 bytes
SHA-256: 36e1044dc1c6e4269ac1e922ff5cab98de99227eaa19a29e2c5cfed10669889c
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 10412 bytes
SHA-256: c5bb9859e5b73ec394efd105b5fbcc7dc916c9d0df89a97e5c99659200449a75

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