Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63258600f129b95…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 01:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 42483cf44e8ee885afe789a919d5529f SHA-1: 5b0f3cca76f68ceba03cfa5a6405d1ad98eac40f SHA-256: c63258600f129b95f50ae8c23516d1fcb9cc5d045ad12203ccc3c66115dc56e2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised websites, suggesting a phishing or credential harvesting attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161486c9f14265---zuwotisere.pdf In PDF document text
    • http://caratow.eu/userfiles/file/75284210751.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/2478511.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/bizifadexisupuru.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/kukegibedan.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/71121167821.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/75849792264.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/jomofolire.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/21196724998.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/wepogugituwakuvivil.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/92886985831.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/lupiladituxaginexeruler.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/49527993207.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/19005530873.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/kopusazerovorokadibat.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/29856535774.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/84228484594.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/71ae18ed05977e558a501d1d7d54fb93/58642052012.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/nobunoxesujakolusul.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b537283fa---96341267005.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/lifituduruzuvil.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1906217415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+edit+a+password+protected+pdf+without+passwordPDF 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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 10744 bytes
SHA-256: d067a7cfd5a5b86eddfdf7c17b2808f429325217ab985059e9a95e19cd9fdaf2
font_02_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 17676 bytes
SHA-256: 51a6e86fe80010a5471cd54a53bce7c51cea7ecd8df4d6cc181f60208a6eb65c

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