Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b47c985260886b…

MALICIOUS

PDF

85.6 KB Created: 2021-07-13 15:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cc6ff9ac5bc5f3b7805aed80d40bac6 SHA-1: 25a2aaf6ae39e3bbe52983c2707fa83ab592209b SHA-256: a8b47c985260886b320d427bef18eaf3051c6c5479bdf1c8e45811df59eb6a51
164 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download button' lure reinforces the malicious intent, likely to trick users into executing a downloaded payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://alnoorcity.com/userfiles/file/xomijikukokizagad.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c88184e2cbc---posafezikarij.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e659fd69a9---zemoxoxasu.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/bikugudutotetub.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607701774982f---53842147291.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4f1441f5ac51a7d9ae2817f53766f62/toxuvofijasilisagutose.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55012acaf7---5957647657.pdfIn PDF document text
    • http://hifimarkt.eu/kunden/kronhardt/ckfinder/userfiles/files/52723749461.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af67ecf32df---28910489895.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/e89l73ed6n7cqtgjctm0nbvma0/85732772496.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/iq3bjprd0p24oi4966tqqnddv3/saxibopapivas.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/53613063945.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/733093a7dff39a13266de047048c4fc5/70361822710.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/muxas.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/75884265151.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ba032300b7d898b6d99d2a7d080dc9d3/salekutogitof.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/786da349967108563fdabad91ac0ad03/duriginakapamedi.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/2345239905.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/dd4ed8e973079631219939fd30565db1/kimizutuwero.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/fomejofonipi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607667c01ad88---67541155078.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/vugonojevinu.pdfIn PDF document text
    • https://faprosid.com/file/87162255773.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050223485455.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/57473604293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=asme+section+8+division+1+pdfPDF 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_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 17584 bytes
SHA-256: aba29e5b11d30cf23cc8bb4315f0b92ab9fcee2d7b5c779b1de50cd825ff5064
font_01_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 10780 bytes
SHA-256: cd4fda974c93425b9060d1eb2fc098d2ea873216f16da452939fe2b34681f31f

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