Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f144334bfb9f39…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 15:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f903ccb9f73290f666ac7ebdda9e0357 SHA-1: 787c520fc613da17a129917bb054974773e6f391 SHA-256: 51f144334bfb9f39894962ccbf036ddb4ee54cd5f7db1237bf8492095174ee20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate a likely attempt to deliver a phishing lure or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=pancreatitis+cr%C3%B3nica+pdf+2018 PDF link annotation
    • http://sziazsauto.com/uploads/files/ruzovozojevumo.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210626032913.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4702d92cfa---galel.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b797e3fbe3d8b2b44d988ab300625203/39420734506.pdfIn PDF document text
    • https://ebooksweb.net/files/file/7373209602.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/81490447739.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609254a1a8d61---biraripiwoxotudizojed.pdfIn PDF document text
    • http://aven.su/userfiles/file/51208044264.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f22a6dab---sofasakugodelapi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/osdg803eheps3gfd3hon97k4k2/logugumeviwago.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/xabufokupivisegonak.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/vudogoxoxunofivazozasev.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/mutigafofanibimas.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/debebibenitazaweri.pdfIn PDF document text
    • http://biomehl.com/images/content/files/wosivakolaromukipipujugel.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5abe1447c---72342671626.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81cac8f80---zizenek.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/85517933648.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/M3zhqTx6OjLB.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/86057247445.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ba93e72bea9a73b555de5436031807b0/rumuwu.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/44627369513.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/natanugo.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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 20516 bytes
SHA-256: f3ebc493bd8d1c3ab807236acc2cc7e6b4be878803b76707fb647a8e9f896ee9
font_01_sfnt_off00011922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11922 11088 bytes
SHA-256: cc98fb35f27f4bd8e05f064368ecfdd1afb74fd9138c8c6d563f10f8f1b97de3
font_02_sfnt_off0001333e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.