Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e82089528b457f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 18:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 365e4e1c5e84af76920dfee3de842fa5 SHA-1: 121feec2d982f9464f2e1fb21a5a04886f58a7a2 SHA-256: 93e82089528b457fb5fd08c02225d49ab81be98b9be40a16b2b61f38de5cb1cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=simulation+browser+games PDF link annotation
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/puzokivalanoselo.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/84893467425.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/bigovemunupirilonexejif.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c029b4f7ec---65241736630.pdfIn PDF document text
    • https://ratosatu.com/contents/files/91555747350.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/xopofururojagatad.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/20049742442.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/nokejivediruw.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b191b5d5f---83840395813.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/90387769078.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/2455228929.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/25813236911.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/werogenori.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/8689713367.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/39110248731.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a061254f---fumisapevazumotuzamejeri.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/8672472573.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/begarebonofapadipijopimi.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/78825471712.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/b7rmacejebos4bll2q9o3slhc7/5234121945.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/93222071633.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/63a6ab38e03f90d594fce343c3c72d9f/86394551467.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7nr2uuf0v2spu34pjgnl9jrg8j/sidewimodilukosijebepur.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_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 10852 bytes
SHA-256: c7553a31410e0f2e257b92b8fdcb64c478cc408c0a8a8b196c6b83eaea628f2c
font_01_sfnt_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 17312 bytes
SHA-256: 90655111153755c58912b6ee492215e4a472340237b203d04e2f8cc39a648dc0
font_02_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1