Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8ff1809d3a86e0…

MALICIOUS

PDF

77.5 KB Created: 2021-08-29 16:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3b556f0724afa3edeb9ab09176fae3ca SHA-1: 51d19c473f9584b5ebd24af85b1b839563dab10e SHA-256: 0b8ff1809d3a86e0c2561b660ef01ba70e3af6a0943ac6bd4d4a437cdb1b3367
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The presence of numerous links and the use of 'utm_term' parameters suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://catamma.ru/uplcv?utm_term=the+orphanage+mcpe PDF link annotation
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0510faed9ed8e16293582ed3fbd67a99/fozokasazizakufux.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f4dfe6fd3---2997697144.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/jeburad.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00052d7efc---98900560668.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b0490489---nigowij.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pafidakigidasur.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/97223278560.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/56466555296.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/45874013359.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/92605639724.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/pezosarevuxekebokupafaki.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be6fc58961e---pavudesevepiba.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/020738121309.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/91992589214.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8l2fp07enk577kl23liufm22b9/vunatilep.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaa0f801bf---59059842457.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/bijix.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/065456960d5ca29c8f9e435c3f6ecf5b/90068625831.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/makewupomuxasupap.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/16415539725.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b601809c7---59269418360.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/kekorisanuge.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/72237321154.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_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 17140 bytes
SHA-256: 39d70fb25b1d94a1f2250f90b3277e6e31bdd821b03fcaa0feceb2879ffa4050
font_01_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 10380 bytes
SHA-256: 3bee011359faf09335c410319955c90256291f58d90ef877840a1d0653ab5418

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