Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7b5c4f1caf7b69…

MALICIOUS

PDF

71.9 KB Created: 2021-09-06 10:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cdd515940780f6ebfe29bc62343c1e47 SHA-1: dd30bc5bfcdf762eab9210fb9cfa7f6c49414889 SHA-256: 3f7b5c4f1caf7b69d57bb2de62b27f49e79a817a48e4ec62c3154f9f9cd0708a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript and a high number of links to external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=the+beginning+after+the+end+novel+pdf PDF link annotation
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e809e89fb---28870366947.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210714071400_9m6jdg.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160adc17c2741d---16106673407.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/66321260623.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3efs9651n7a7qd34ccvnh4ve10/tilowudonofilipevi.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aee16ad74---35110452439.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/3h272ullqtvhm5msqjn9332sn7/fenunetijudesufufekakaw.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/98633161547.pdfIn PDF document text
    • https://kar360.com/resimler/files/subaseximovunuzip.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/31594074835.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099bfee16c02---29264160085.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/lixupuwamosipitozuwadipat.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/tududilimudidisamirikum.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee65d1bb09d---29025643262.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610f2fa050d38---78942533892.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099f1681954e---jufibitibejenujeb.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b6cce32b988209e84b591ee1bb7f6bd0/47151218569.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f446f308206c3b280edddea3ea29f25f/61716064966.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079f4d891276---25577831378.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/548f343ffa8a2278c840e228dcd31575/27077214237.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e26ed890c549617e0fae288b015c013d/pukejadafesopilubija.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/453658107.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/sezexotimosodejejas.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/jalomivifozofinev.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/33375780741.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_off0000b75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75A 16156 bytes
SHA-256: 1525671782124b087240e0b84ba098add37fb93be1c2829db281995b81ec9479
font_01_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 10780 bytes
SHA-256: 562ab31b56f41f7de1e54b6b18f1e545abf2f1f7c7ffcb1b6ace3f1f2f804b12
font_02_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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