Malicious PDF — malware analysis report

Static analysis result for SHA-256 81434847008ae8e7…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 18:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c738370cfa3cdb823bc502b29f14f275 SHA-1: 1518c6d8c72d55a912ed472941603cecb5d6496e SHA-256: 81434847008ae8e77660a5d9c61a51ff9adefc6dd12cd86406db709741dce94b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of a link farm on compromised WordPress storage is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://diskacme.dk/images/upload/file/merat.pdf In PDF document text
    • https://sskundal.com/userfiles/file/labupezujoguridupezaj.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/34861246677.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/38763552066.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5461a8d961259b691ede87b35d648f6d/nutagilozavo.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/14303740195.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/19157111068.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/99790585486.pdfIn PDF document text
    • http://ipublicity.cz/data/file/bavogipufimu.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/53219217302.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/tukodomobiz.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614309168618b---binivesepirunilefadufuraw.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/vopezezevojadovosowudub.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/munoxe.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/4692864273.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677c629078---mofevob.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/ginenazukeriwefawez.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/guketud.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/30454393843.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a65758b057d7258a99f49d0b248554de/veluparapanotusokojusobob.pdfIn PDF document text
    • http://stylekd.ru/files/bitogosipipazidov.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/jutanozorozagisomakevokun.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/ritipezavumujurasukumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=yacine+tv+apk+download+for+pcPDF 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_off0000beb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB7 10672 bytes
SHA-256: 921f73af5e0bd1f1008b5a9eede917fba6bb0689d05eb3eda4ed673700d1dc41
font_01_sfnt_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 18112 bytes
SHA-256: 5a8e9dedaa625f7fa97965dc02bd9b5d1245ccf9bca7566769ac2e571c27fa10
font_02_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1