Malicious PDF — malware analysis report

Static analysis result for SHA-256 623e6bed2cec2fd0…

MALICIOUS

PDF

78.1 KB Created: 2021-09-09 07:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f913bc950fddfca91c5775c4ada8bde1 SHA-1: 191f95a99c103ff6c5dd02d898a8e645f3dbae3f SHA-256: 623e6bed2cec2fd0a138e5a3be64bc2a4b5059fdf057f700ca7d0b94e0b2a2ea
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various external websites, some hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest a phishing or malware distribution scheme, likely disguised as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=hill+climb+racing+1+apk+free+download PDF link annotation
    • http://www.azurwelcomeservices.com/userfiles/file/13628767468.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/59783938361.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/23535333695.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/2467186154.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/q795f1jelbj92prfclne7d4sao/85440572547.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902184522.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/85750746784.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/sofivibudibikiloloxifefew.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/91074101399.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/81377865044.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613341986eea4---dexofot.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/babilixuj.pdfIn PDF document text
    • http://crm333.com/documentos/file/ropipadedezozar.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/69420793174.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/penujoz.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/vimajaxomogikumime.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613247336acf2---saganigizavi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e77fd994cb4155431731240f42c3c96a/wipilefajijupew.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/vetinabixidadi.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/xawusejosigedepunozonuso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330ee4c50ee---wugaligofupusegivewe.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/mepekedu.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/sezujagedegusaf.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/79930110592.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_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 11060 bytes
SHA-256: ba7d65b81f72e0002f62f68474496f725dd5e9101fecf67a987e6a375d25c3bc
font_02_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 17580 bytes
SHA-256: e0c1f3b369d041288211952dc6ca3cb7a6b4e13cda606914a70ac1f90d34c552

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