Malicious PDF — malware analysis report

Static analysis result for SHA-256 776675b872f0a0a4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 05:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01be5b0579c4a1dda533b42ce74edff1 SHA-1: 4cd08ff243b5314f14403607effacc4f89431c80 SHA-256: 776675b872f0a0a4838853d4fe106faadce29f55277d9a06f44997b56d8f192a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, hosting numerous URLs that point to compromised WordPress sites and other domains, likely to redirect users to malicious content or phishing pages. The presence of external URI heuristics and the compromised CMS upload link farm indicate a deliberate attempt to leverage potentially untrusted hosting for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9131

Heuristics 5

  • 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
  • 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://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5cc70c557cb403473f97aa2409c56619/popodaxetem.pdf In PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/4af4412a18096827763584586e482bd1/52699878315.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/mupavuw.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/vobubeji.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/lavojidimovi.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/pefaxezadolutinuwulu.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/62160242626.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/5176797529.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/c5cd1d39e7fe092861b8521dee500b73/48335931611.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/83356312144.pdfIn PDF document text
    • http://altinay-law.com/images/file/5517183887.pdfIn PDF document text
    • https://yodobashi-church.com/73282172871.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/78312892324.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127428772e5e---rugilirove.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/pobexazojinimiripo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/11793808775.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095bae02bc0e---89335145182.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4baa4e1a---44386732246.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881d84a287d---79803967587.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/86254175369.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071515203573499.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/wiwitixijotaxuzojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=area+of+rectangle+square+and+parallelogram+worksheetPDF link annotation
    • 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_off0000c7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 11380 bytes
SHA-256: 8f7271ff93abc0d72f907dd52259a1957f2eb13ba84ec931b69fea1b8b1cea3e
font_02_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 17624 bytes
SHA-256: 2f6d372913b9088eeafd912cd084d62eb20c120b8d6edbdc25a02c446b728542

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