Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83a834ed8791122…

MALICIOUS

PDF

105.0 KB Created: 2021-09-03 03:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 237d95dd528f8dbd69f7be6fb6b003ef SHA-1: 9fda3e2aacabc511723a403aaf6610feaa0b7cd2 SHA-256: f83a834ed8791122d4b03b351cdd2d5f55b6127696b59ebd4c46c308b6a54d55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm pointing to potentially compromised websites, with a high ML score and ClamAV detection confirming maliciousness. The embedded URLs, such as http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/76ef0c521af9e38517dcf1913d49e15b/66902398883.pdf, are likely used to host or redirect to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://candientushinko.com/images/file/guninededafidikawinaxi.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5e56fc71---44130619684.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rfid90q6tqqo56fh3hggutlpk5/jeraxef.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/kudekejenigedusululazowuw.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2574e640d3---1812776714.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0bj8qkbok5tl5ttiqbvtt4l626/gazebutuwovafonimitusipap.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/mixelaxosowavuvote.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/sijedogelanisoratutu.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/mazewaxov.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/76ef0c521af9e38517dcf1913d49e15b/66902398883.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/54513664043.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/89110546635.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/358f1b8c9da28213510963837fd08ec9/xagajileged.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/fimofovixubedosos.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/foxazesosarewesaralene.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/e7eca4af35623be76884dac37661ad7b/11904613473.pdfIn PDF document text
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/86305107203.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/97477979435.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/rupevuragunitu.pdfIn PDF document text
    • https://ibextrail.com/editor-images/muxidaxorotetid.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/63810666537.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160983434ab4b5---30936957942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=network+theory+analysis+and+synthesis+pdfPDF 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_off000130f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F6 19640 bytes
SHA-256: 5cb9ac958bbd61ad51d1481963f9c008b226861bca2b69bad5d08ff5c0f646bc
font_01_sfnt_off0001648d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1648D 10864 bytes
SHA-256: e64910ff6b9011c7f90167667807559b96b572f2dbda7f9dbc76a294ed9518ec
font_02_sfnt_off00017db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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