Malicious PDF — malware analysis report

Static analysis result for SHA-256 394034d04ae027c9…

MALICIOUS

PDF

88.4 KB Created: 2021-07-28 04:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b71f91ef2ae754e7ec8c51cbccc48b4a SHA-1: aee04f87927c2352093aa07b22b7b1be7d562198 SHA-256: 394034d04ae027c922bbe384d7725018ac7b72cee32dfbad15df3073f4297c28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers. It also functions as a link farm, directing users to multiple compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7dfd7217a---nakurezubu.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083bfae370c7---womasumepixaxikuwatupevul.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/17751256264.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c282b9ccd53---xirepafofefiro.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uir2pormgbl0o9n1k6dfdhmv3h/kosisapob.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/mamusizedewemetewifigiz.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/jipipujebixisinanegavuki.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/1jcvkq8ri5nojgcbv5o100g09a/tuburipobuduvereb.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609883beb7822---gazekonaxixal.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/febik.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083846562d5c---najezogawe.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094b46f41f42---zafawibafeketi.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/51508392134.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/c797feb0daff1a8f36479f34fb3b0712/24976325019.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/30967645803.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/bawuwaromi.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/78812798719.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c414ed6e23a967ca2ddee8e9ae23bdb7/29141780434.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/1942074209.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8e87dd3b7730ca44a56379b6a8220d02/pugig.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/26935448828.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/junuxiramavijikutizorumiw.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210722110130.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210717003747481157gmg9au.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/65536334702.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808bd3911d1---tibilapifida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=are+school+uniforms+to+expensivePDF 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_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 16980 bytes
SHA-256: dd60ff2c521bf3f5d97de129b057c18f017d0ef7907b165523d2a9278d1cf4f7
font_01_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2A 10832 bytes
SHA-256: 9406808b952dee3377bded5c6a9905a6695b7215d0d78882f9650e83aea424b2