Malicious PDF — malware analysis report

Static analysis result for SHA-256 51891ad58c9720d1…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 08:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e77fd3ddc394383240a4e4908ba89ce2 SHA-1: acc5db1abd43942768a7c99e62cc92874b9ec1a1 SHA-256: 51891ad58c9720d12b2c48755c739bb6eb88e1a6f048aa456f715eba3f8295c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=causes+of+groin+pain+in+males
    • http://centreforeffectivecoaching.com/media/file/68273252199.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b32264488e3---kekipizimitetijuxexilom.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859cd521bcb---65478480547.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a879e86b506---30513576236.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160adfe4dea791---1542654579.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb40e0f48---34184955711.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1cedd6e3---bivosedadenevexukixavipur.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9a1670eda4eb65655657be15bb643560/59423417787.pdf
    • http://promador.pl/userfiles/file/50790291661.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e583b741a5---28553092704.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/10969a70ac6674be3f6029edb2845e0f/78911798716.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/509147b8a457ef8840eaa6af1b9e05b3/munilulowumumezexaw.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900f2b93a75---muruzibekogurav.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/68e7a381f788be5566158aa3569f3565/kipurowisana.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/vcshk3m6lgkdkt6p5el0j0v07c/gopesuwimuza.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d84e485b---waloli.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/be32b5217c9580848591900aa83e0f56/sonitedeferugudajuju.pdf
    • https://milsagliksen.org/upload/ckfinder/files/53671342744.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/bdacfd55d4e6e85d83507b91f7b24157/tifewolenemukejemasasat.pdf
    • http://ekotop.eu/userfiles/file/fokerufitoxu.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda5ebd026---42032724662.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4cei44oqcd0t05cikf5dgle0q9/49465618674.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c126aa8798a---tabubet.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/167baaf544e70868138b6c35a6fc41d3/kajunezi.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d025213432fac68680359bb0c31ce233/xugekajiludefiwedav.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ca.bin
a4287d81e1948dc236d06760d5dae1cbcd1a6b34e77174fd73dc92113e64babf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 10736 bytes
font_01_sfnt_off00010b66.bin
2f5a3adc63812dff9f534c6c5cf36077c01405dde6affcfb11b8e22ceebdf868
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 16524 bytes
font_02_sfnt_off0001367a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1367A 16792 bytes