Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dd4dab287ba982…

MALICIOUS

PDF

101.4 KB Created: 2021-09-01 17:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b598751fd37cf67a95e7b1983aebe86b SHA-1: f5cd612d526e575d40ad0def9825877085b0d06e SHA-256: a0dd4dab287ba9821ceb4eb99e1ae0a5e63ff54ea2ebb7b5d7ad7f5c9a639b26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to PDF files hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly show a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://risme.vn/files/zuwajada.pdf In PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/84279304121.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/62876574097.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/guzejapiposofeb.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4681796c2a---jakajawemagafo.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/saravutobagak.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/situparavu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/lezasejipovosevuxukijoz.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8cade51e---43451819224.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog//file/80731656927.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d62a14f8---79572285029.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/70630332961.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0fbc809453080bcc89677c67d10b33ba/wisom.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/fafasadodejewudemon.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/31c4a41af4e800bd154bcf1623c00775/86926019806.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/kepililomet.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c96431d0840---kopikakifaje.pdfIn PDF document text
    • http://186086.com/upload/files/dafepujovuzenejibiva.pdfIn PDF document text
    • https://iword.de/userfiles/file/sufunenijafurew.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d255a79207---xamamawovo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0bca44c6bab1952743a881dae1af4b71/dexakunevobamabofepum.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/20020159650.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210815164954.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161174b2c4eaa8---83544961946.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/23030367117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=knight+games+unblockedPDF 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_off000127c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 17960 bytes
SHA-256: 1de1174764820dddc5592c8fefcaefb26800164d88ce952fbab4bae03e4efcbe
font_01_sfnt_off000155b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B5 11040 bytes
SHA-256: e8feab212a5203ffa83a8bcf919efadbad271a298a932deb6c35cd2490b8cd50
font_02_sfnt_off00016efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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