Malicious PDF — malware analysis report

Static analysis result for SHA-256 4102f6d5c0173aab…

MALICIOUS

PDF

92.9 KB Created: 2021-08-06 14:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9aae08ee8f6ad85b45240cce88e3ef6 SHA-1: 07d38ecd1ee9669b44074c8017405594b239b790 SHA-256: 4102f6d5c0173aab6547ec992f19feb477ff08df94524c8599c7d9e197fa2a20
156 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 upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the link farm structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9fd4fe702c2e2bd538379ee349ad3edc/gupepururago.pdf In PDF document text
    • http://vksraja.in/fckeditor/upload/file/68535581455.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/77320422417.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c99e269ccbf68201e9710ff6fcd687ad/fufupag.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/11141608786.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/pevb2sgt9ctrqmo75ur9h536dr/fedibotuvinanetumuzefut.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1623081327.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5068f1317a5290cad78f52a3a9fe633b/91606341573.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4fa3c229---74500759942.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/90325517844.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1717af1f26a77dd9a69edfd7d190c678/86006787375.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737cabad5c9---puzop.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/21ff3031a679acc52dec8e5ec3961165/kigusimarexibelux.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/1940117340.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/80172332257.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/bimig.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/09dd1c3e761455ac40d88589361e5ec6/50094821580.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/gozarixifoxowuruwage.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/jamusurivinukugati.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/galofupibiruxixegebabebe.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38a5f30e5a---vuxej.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c98e31106---wamosovajinokoj.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e40a3986---86822475395.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103ea910ba50---motiwovusodekibogijevutib.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/giliguzixadodefaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ayatul+kursi+translation+in+urdu+and+englishPDF 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_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 18168 bytes
SHA-256: 027943c494ba060e3b6aa0c86736a13db68c702d02873bdfda3c5647992d3e41
font_01_sfnt_off000133f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F4 10816 bytes
SHA-256: f7e7d974a25c5c70247796fa83dcbd4bd331b3241df8fec5e173a6546d04b62c
font_02_sfnt_off00014ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1