Malicious PDF — malware analysis report

Static analysis result for SHA-256 7901aa8154a1ca71…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 11:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7733a56b3988e7af5b15e7cac0cb7762 SHA-1: 6d46be242be06424204554fcfa64bef5bf2e5b4f SHA-256: 7901aa8154a1ca718cd6e12dfa4208feb6e5bc3c746f16764fda5988da560885
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to direct users to malicious sites. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=pokemon+platinum+fast+egg+hatch+code PDF link annotation
    • http://bjbtrh.com/files/pic/file/25037676250.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/13889753590.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/jegeli.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210901114550.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b017488082b6aa84e6bd4a1b9d74587c/57525364643.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/82586971841.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/71170023729.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f514bd95bb---funawikiretumudimatep.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/jetodutu.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/52794418209.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/35395162995.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/zivev.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b476ac8cdc---rurojadorotope.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/32580121360.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202196131532210.pdfIn PDF document text
    • http://canoeing.by/pics/files/labefasoxegoxuxibixa.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/76320974651.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/sikuvetewejepabujixiro.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/79171804346.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8c4f74be1c23c594dad337d1e387d093/dinikabenijo.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/13073659093.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109022109388755.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/56641102455.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/50774685742.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/98373016335.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f3f0e748628a6a2bab62b6d9a1d6ed87/rurijagako.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/50059513330.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/49960699078.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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 17836 bytes
SHA-256: 3b73d67774925964b8f7f3cdffc72bac53ff74f1d9161d3f555be0b9c00075d7
font_01_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13149 11160 bytes
SHA-256: 4c58eec979771c68b63004ac1b29c43147bc9cf8840d3f9125f9a0d73b903c78

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