Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e2595d0718fcaa…

MALICIOUS

PDF

95.0 KB Created: 2021-09-03 23:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f6292d4a3cd7573c761a5df6ac8ca6e SHA-1: caef35d4d6a769d68b5f68bade3afd319e9c4e03 SHA-256: 40e2595d0718fcaa5386aa65fbe2044d7198f3ca0ae14201fa39fe378ce6f514
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://aolisenjiancai.com/data/files/55458128408.pdf In PDF document text
    • http://vitalchurchesinstitute.com/files/file/45886351354.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda44f2bc5---13959341809.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/kalasetut.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/5tbc7vg7ln44j3bnsi3j51f136/biruzanafojomifum.pdfIn PDF document text
    • http://rentaruedas.com/files/others/fiwufanafirimolowof.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607412b69d64c---valezujofixosof.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/sisifulege.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707c2e72f0---lafarexejaluwigel.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/bosigixekemorugi.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/88586767987.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df5234ddcbe---1728655729.pdfIn PDF document text
    • https://advik.net/userfiles/file/japugalorodizaj.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a3735dad0---33327475069.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/57173349954.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/voponimirovorovedixemuwe.pdfIn PDF document text
    • http://usagimatur.com/files/others/35850033152.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210710190651.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/94521246511.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/oupmudj7s953175gekjrimh1bf/xavifipemas.pdfIn PDF document text
    • http://ceroki.com/image/files/vinimafamu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3mhvcdsrsv2gr3t6i2dtcueoo1/14251445552.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160727d0683a20---7400502531.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/arj6g496tlilrm8tviu2fjaq84/pexijefawufadikovepivanav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=canon+eos+7d+instruction+manualPDF 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_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 18320 bytes
SHA-256: d331f06092a33d8d78a243ab8fddc8ae87a56038d20991435c29fa179e650f61
font_01_sfnt_off00013d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D87 10712 bytes
SHA-256: f6ef123d2ddec7cbf29aa1d63e6fb6dbfa227b97b0aed53c5272850ae7f106f8
font_02_sfnt_off00015638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1