Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cc7a5224f062d2…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 15:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b521b9eb4c05d66644775e6496288bc9 SHA-1: a57ced71c24a9958841ebcb77599cf29612b0c43 SHA-256: f9cc7a5224f062d28673f8a0fa104633a96ff63f879f6ba5b4f3395a001083c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to serve as a lure for further malicious downloads. The embedded JavaScript is likely responsible for initiating these downloads or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tekstilkentrehber.com/upload/ckfinder/files/53561798206.pdf In PDF document text
    • http://gtlmarinefuel.com/userfiles/file/nosovinuwekun.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/031ec84b2319ba0d1ec145965d00f2a9/34495347562.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/27194193432.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/lotenupelonalupika.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/telifesakasozenizix.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef769be835---genesediridufi.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/xekukobur.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/tokafeju.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af709c17c81---64647681938.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda49a1d4b---4090727110.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109021352229563.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/dasefetixilafazakajerok.pdfIn PDF document text
    • http://centromp.it/userfiles/files/lerobinowivelaxuganif.pdfIn PDF document text
    • http://siembra.me/uploads/files/videfipupatudowag.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/527bc224328eb00660650f1362f5e2e6/42046430091.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/wilipuvexiruxif.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/6cdec37aaed6411ab50c51d4de77fbd9/58107801367.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160928f72677ec---zajupojerogiruzareven.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/xerikalikifaripetawi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b4882c7a4---39007349543.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/35343017888.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/68647ab20a4c31d3c7dd0966ef586051/jojutezosufuvisisutavu.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/zamofiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bernardino+ramazzini+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_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 19324 bytes
SHA-256: 72912c4c0c4c472c49bfb97842720c6f7ddda024b9b75ee980e0ec723f4806df
font_01_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A4 10460 bytes
SHA-256: 7ec656d3462cb3b431dba8f9e1098e34c74191fd39f8caa0394585f8a5f349e9

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