Malicious PDF — malware analysis report

Static analysis result for SHA-256 c348b13dda6b72c6…

MALICIOUS

PDF

86.7 KB Created: 2021-09-14 05:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea40015268a28ed164fb0d0974a062b9 SHA-1: 2e69e931a72e7c8b34f75405d0313497ba531060 SHA-256: c348b13dda6b72c6060a254a3f497abd21e475b67bd2b28efa9ad1aa956f378c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms indicates an effort to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0be637d8---51963717557.pdf In PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/mezaridebivisap.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4830a7bac---nijimukiwakaxi.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/92151665863.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/66074427487.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7n0732p942m43oursoqj9n7db6/18946994150.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/64032942542.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6cc4fdb3---66646492410.pdfIn PDF document text
    • http://cosyromania.com/media/file/dajakizeweteb.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac79923d88---givejagiteja.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/82575601689.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/30210548156.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/28491224375.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137669d6f93c---52948431312.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/gipub.pdfIn PDF document text
    • http://findusafranchise.com/files/files/junuderidogij.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/25513281566.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/75392409169.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/40379903413.pdfIn PDF document text
    • http://orlickachata.cz/files/files/gamuzimizopufifexotimivom.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/20508571103.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/ratagabafejexudaf.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/i0fqtiqbcu73mcb92k9i011uh1/loruginuvudojovejatubow.pdfIn PDF document text
    • http://akademibt.com/resimler/files/wowokigexivekafanaluzut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=elvish+last+namesPDF 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_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 21284 bytes
SHA-256: 813fb02f72975acc8b8df3cbc178cd71b2a07360ef122eadcaa7e8b5f7c8b649
font_02_sfnt_off00013725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13725 10200 bytes
SHA-256: cfdbb5594da328f30c417e3b588b4f5c018cf099b9d0dc4f66d27ce2d66ed9ca

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