Malicious PDF — malware analysis report

Static analysis result for SHA-256 133db1bd855e79a9…

MALICIOUS

PDF

84.4 KB Created: 2021-07-07 07:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f69d8fa35235db26c534e214bff8ec88 SHA-1: 36b84667efea0a6e20a9f5597e19d51ca551501a SHA-256: 133db1bd855e79a91830c30bfa894b05b62d0b0857cc1c6a1deff55d3feeca4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, including a link farm hosted on potentially compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://drafthe.ru/uplcv?utm_term=dreaming+about+shooting+stars PDF link annotation
    • http://cpgny.com/userfiles/files/68112999696.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/dunik.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160704f5546171---68881034296.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///zetetatawamubaguperizalo.pdfIn PDF document text
    • https://senhewood.com/d/files/68324589050.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b65472951---sojijabarekipazove.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160835a7f58f22---54305174709.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16083fec102d7b---lezetibusanifo.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/zavezanixixe.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/196e7df60cb6ac54f53dfe102e50983d/nugekafegupara.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/4265963140.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c856f68718f---14413606601.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/xukumafapibevetufesipolij.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/77116034354.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c91c881c871---pegivazirazuxoniw.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/86292571905.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/vakujuresofedijonako.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/j5tba8811aev4p7vb6bhfguks6/82414195571.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/milirubuwipawukusukewok.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/8dfe5fa1b61eef4aa430ee1d713fdd3e/xuramoletigewiju.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zotofitaxodusevaramiw.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/familaxifusikisimugeliki.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7e36d7d92---kufukib.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa0fbeb3a7---palirebe.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/wedoviv.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_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 15844 bytes
SHA-256: 22dc1324717f1e98d28f6facd827e32d1bc156b6e46604a4b5d2b1af4cf8a75c
font_02_sfnt_off00012bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBB 10752 bytes
SHA-256: 87d9864096190082923476a9f8687f7f707e43ee9ab114384d67e88c72569ca0

Open this report in the interactive analyzer, or submit your own file for analysis.