Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc6d48f897b3f1d…

MALICIOUS

PDF

80.1 KB Created: 2021-10-05 09:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29fec6ee49331085374c84c65d4fbe44 SHA-1: 75748bd5a75a568b61f9b4cd9a5c0844af823e94 SHA-256: 5bc6d48f897b3f1d1d269ddbd7f1b3ae5476bbc0bcaf1c61ea809720520edfa5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=differentiate+oceanic+and+continental+crust PDF link annotation
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/7935225766.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/mebeputaxopi.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/pufakunibumobon.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/70501058210.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/72552190283.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/piwomitevuxugulupusegi.pdfIn PDF document text
    • https://anakmeong.com/contents/files/62408834738.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///27799636379.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/pujuxuwate.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/60077930081.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/187851565.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf859308d---latulexebijofikimurilaren.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/49855080621.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16145e6125fea5---97236761238.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471c6ae1770---55653587923.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/vexosegisajanot.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba1975935a---xifimidorusuxo.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/90608540198.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/78235501237.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/43282542218.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/komoxinanowisobamaxin.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/duselafeduxin.pdfIn PDF document text
    • 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_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 17404 bytes
SHA-256: a2153bcc79c2401e891d965f60b7dba8214c68357a78cb3bce48a05dad9183ea
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 10572 bytes
SHA-256: 1fba50dbce09389582ac5ab247bf761650a6d0dc3ff8f908cedb684c5d1b8892
font_02_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1