Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fa5d6c65708995…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 16:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 822c731e493dfd7884c927c0ab1e3cfa SHA-1: 9df6dd4de7dfba9aa1e7c856b67d7578506ed0a3 SHA-256: f6fa5d6c65708995b05eaf877fd6cc98630fe31d6f81fafcef9464715a6c7f20
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ukkies.be/userfiles/file/kaxanozerawolokipafol.pdf In PDF document text
    • http://knauto.com/upload/file///zegomepadenazipix.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/74308792996.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/49293677179.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434aa122c50---perimeta.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/veraxanufokelila.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/50068147689.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/49973098285.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/darokilobibosesonozudox.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/41945929207.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/54236627519.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/tavena.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/781b3cd6bd6425992d97555d0ea9f435/volofexenoruna.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/rasiwo.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/mipezusu.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/lisiwuxogokikewagixupar.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/473fb07977d6060b2bc08b0b0a762511/28269845565.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cc0a369c7---pupus.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210906001810.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/risamusekaziligebu.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/pipezomipezajez.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/wejonuvarigirikezazixat.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16145bf5d0ad53---84781880426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=book+2+mathematics+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_off0000b1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D2 15008 bytes
SHA-256: 27ff219d1d209d007dd69b71094597371bb4529e3bb6a3d253e7395949ff69f9
font_01_sfnt_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 10900 bytes
SHA-256: 82ee1af81dd468d3cffe73a1ec0f3d70473a063fcde16f958752c671cef0d0cd
font_02_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1