Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f788a2fed7dd93…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 23:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8fcb91f5bd19653e6b34b70928abf2c SHA-1: 50f089b0cc9844dac276e65b797b36d5f59fb01b SHA-256: 70f788a2fed7dd93edbf9856bf026401be88722aed11dc2558a8702a234f5d3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous links to compromised WordPress upload directories and other disposable hosting, suggesting a distribution mechanism for further payloads or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293b0ed8d93---redasowomuvigovonuzomawev.pdf In PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/romowutezo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddc21a2ef5---29611007619.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/627657689.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/jifovi.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gmuam1ano0qcs8o3sk9nudm4he/tikisemunitanemejixek.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/1260298776.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c43d67b0b13---87316422584.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/rutigakabof.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/58760359927.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/6b72e5b567dd2f8b84564d7f3e731d73/sibazozemataf.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9808bfa34---kilujaxiwovododobuwarini.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/tagalej.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f3b464e4b50778fa5d03ae4fe63e80dd/gedovenofabulax.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806876eddd1---16287275185.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/8531086586.pdfIn PDF document text
    • https://studiorampinelli.com/file/lobogodumoduworut.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/34220006292.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/mitesemadelukabumar.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9f70d55872bd4eb96a0ec6b0a981614c/sipunuzitofinipopaw.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210820190447.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/palozirip.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/kalogej.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7a511240919a05a1abdced878b41eb25/wozepisijukutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=calendario+2017+pdf+para+imprimirPDF 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_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 10768 bytes
SHA-256: 7bb9d2bc6480b68c8a489cf80dcddf31773b12ae111c51b82863210387b4b46c
font_01_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 19324 bytes
SHA-256: e14ad9f73961647d5364c8c19d0d05fe0e6d16937405ca8e522581957bce7fe0
font_02_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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