Malicious PDF — malware analysis report

Static analysis result for SHA-256 d819595fc442ba3a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 03:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 947df9739507d6bff989ac154a44299a SHA-1: 658ab5e3a6fd7a3a6035ca3bd69e3b06f6210b2f SHA-256: d819595fc442ba3ab8302dd58d155e7d1492ab8131d1f9bab161a59bf2573dcd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • 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://travel-door.com/userfiles/file/jirezo.pdf In PDF document text
    • https://marljivo.hr/userfiles/file/84817541121.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/l0ihchl3i08ijqnpm14vh67e34/53725980434.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/91076944187.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/19677922952.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/42aff27a53464d9f91bad081b6211bf1/lofavobexowo.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/71703295.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161341f95c63b6---18857828117.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/46580061693.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/mizalitusujebafedijaruso.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/17452976517.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/doumt4suqa94hkgrl56k9v47ls/11187864990.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/gopakuwalubuveseduwebe.pdfIn PDF document text
    • http://tion.hu/upload/file/merekodop.pdfIn PDF document text
    • http://gyliver.ru/files/files/49667439430.pdfIn PDF document text
    • http://scsychem.com/upload/files/tawunanufak.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613951a15f50f---3656902667.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/kugerowuvumonufegomixifa.pdfIn PDF document text
    • http://klhl.com/userfiles/file/71818790945.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/sufojodamelutekubefut.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/74458055727.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/lisun.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/zojetowezenovazisu.pdfIn PDF document text
    • https://techlan.pl/files/file/61809234294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=airplay+xiaomi+mi+boxPDF 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_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 10248 bytes
SHA-256: 67c36707540862d96fef22d67beb424ae8d0630e4393d9ec3940516a7bc2f984
font_01_sfnt_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 19752 bytes
SHA-256: e988720b797c77ac4f0513c0a0f8489816fb5443c8d73d28729ad1d43acf044d

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