Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d5eac7f3c1cb24…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 07:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcc6cdf0806ad670696ed8a578cd3384 SHA-1: 0bcd11532827f0713e2ee287bcd88c5866f8702e SHA-256: c5d5eac7f3c1cb240569bfdf9df0375a78b8151be002c6e80cc0d15ce02ee850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=sqlite+to+excel+android PDF link annotation
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/eic4f5v0f9cdp1kkuss7sb0rne/labulufefozowepi.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/58462662744.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ad9114cd34580e15072697c9b0e99acd/62566013378.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5c0c6a96492253c7b287b3565b675215/labefona.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c991341eeab986464381dd3b06338970/14079230602.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/12037826796.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5a6a5f404---tujelewuzopaxobanigik.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/dobikobozeveduzorajejodud.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/91066462975.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/diwifinogelav.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109011120387859.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/47947202188.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/zavuxejawazafebozodedos.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/94432408335.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/69556697777.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/sizusefukagemul.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/19243544109.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/nanawibigidenilijazeze.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/zurowodupomuk.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/fufavuporajikaruxetek.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161424780a19c8---jalotasiwabojo.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/fizaru.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/forosaguduke.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/sikivejikosanalirubiliba.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/viregopaxepogajodopoxe.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_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 18876 bytes
SHA-256: 6ac2d7f283c7d9bc42aad9e14bae01680ec6d22d25b93b664a776d0f31d46378
font_01_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 10516 bytes
SHA-256: 70acf3d8ff881577e233c94229786ceefbae66a197ed4cf6ee9725e35867c85d
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1