Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a53b851c9d3d47…

MALICIOUS

PDF

77.7 KB Created: 2021-09-11 01:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cd848d7be5635debf132e0314722e4be SHA-1: 8566307700b5e7240990eb8d5c0f47d1d3fed39a SHA-256: a2a53b851c9d3d47040686c7e8e6d5eae46741b566302fdf02fa4d1c723f689f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or directing users to sites that host malware. Heuristics indicate these links are on disposable hosting and some point to compromised CMS uploads, suggesting a deliberate effort to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://pixomot.ru/uplcv?utm_term=10+letter+words+starting+with+w PDF link annotation
    • http://lexprikson.com/admin/style/images/userfiles/file/61088006799.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/tiwowidexizuwuposis.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/85616666165.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/jasajugofukixifixativi.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/83649413610.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210906065953.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd23c48ab9---60297274211.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/wuwamimoteni.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/tefuxejulojiw.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3ea1ffe5---mutazilofanu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d900cc79e2d31c03713f1108602b3023/98951361460.pdfIn PDF document text
    • https://gdaniec.com/upload/files/diromekekugitatipimudo.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/59921568862.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/rezisivirexalazodedoromam.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-04/images/files/tokesadolatafuvixozukax.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/ludigotonifebagexoponap.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/19012993687.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/96311305451.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/futavexozukevuloluzuf.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/45947949665.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/pefifowiratisapewowekoju.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/792533295.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/vufotafudodu.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/67010870228.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/10/vadux.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_off0000cc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC67 17200 bytes
SHA-256: 8097ad31f68b0b8f38abcb3effb1b6ff843a13bb2183c71afac1b10a9b6c6074
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 10688 bytes
SHA-256: f12f9876fce32328993061e426a16b622fe34079fd507f624d152a965d14e98e
font_02_sfnt_off00011128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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