Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9145087983caeb…

MALICIOUS

PDF

91.0 KB Created: 2021-06-28 23:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3e40be034f7c2f9fcca695df01f590a SHA-1: 6bef473483c18417ab9e1d2aa517a9d851f8ff85 SHA-256: 2f9145087983caebb997b04234f9e5653a14eafb50ef0dd81648d77f5a0f9b71
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of many suspicious URLs points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096698313182---vapixuzugazotetepij.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba04c11caae---sijupavixibumadubesu.pdf
    • http://okfilm.kr/userData/board/file/29095639284.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099b155f0123---52641006723.pdf
    • http://agcslohian.com/userfiles/file/kukisudiduxibubixiwejo.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759b82180f5---fidobevumujevefuzew.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda2f74633---nisatinozulogefo.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/12835069328.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/9cg1uk84njhceu4bdj5d61rmk7/fanivijatodivijigugugo.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/375323d2d378a731e95b2982c2de8b82/lalifikapedowepasamulo.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7i43leuj5kq6eeu060n3lnd7sc/39347794422.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608a55644ddcd---7546802589.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/10c25b47217886191c900f3b73640682/53492916090.pdf
    • http://crosswaysrecruitment.com/userfiles/file/84842258318.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/h938fkcp8p2bu12jk7a7es4d0c/goraverosolufoti.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899d440b65b---goxezimexezaxozakidube.pdf
    • http://axwelindia.com/uploads/2957306641.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e4aecb3482ccda219f7f74eb03fd4002/31422259171.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1d2965d1ca92e8baa6bff5c2d769ef6d/41652683008.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/064901a407cd3de4c5ad18a679134760/71551879860.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/1ead29e35f13c8070510d4391ab89e5d/92912647130.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/98dd796a0ac6d4eae375dcb14b9a1813/guvubanutujona.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b58e4740459---14286298457.pdf
    • http://artecgroupservices.com/imagenes/file/89819518723.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f1b9be08ad09ba7667e193dd511589e2/xunifudaxiwekez.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1ddabe50---82113738452.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=stock+quote+isrg
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001005e.bin
991654ced5ffed21e4b8d954fdb2977eae14bbf311fc16cd1b399aa0c1511ab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 17612 bytes
font_01_sfnt_off00012ee0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE0 16792 bytes
font_02_sfnt_off000146f7.bin
fd6b3c5c28fe930989d2a5937723353f75c30f521a7cddb2e5ea06dadd893b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146F7 10508 bytes

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