Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c3ea4a6b2aa28c…

MALICIOUS

PDF

87.0 KB Created: 2021-07-06 19:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ce9cf370f85b56262535d812b4fcaef SHA-1: e99c187b879e9d5652223f4756a13c6864d987a3 SHA-256: 23c3ea4a6b2aa28c1bca9502bd785af51b37d57a66f173e18f8a14d1344e2d6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to execute malicious actions. The file also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites. These links likely serve as lures for phishing or to download further malicious payloads, as indicated by the ClamAV detection and ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/1da61f3e05f94b5d60e6028b7b15a1ae/dizex.pdf
    • http://shinies.ru/img/lib/file/zabupabofuf.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/imt37o9mbvee83eh61keb7fc1m/kezepubotazisow.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e4602d1b4a43770f0ab8a68f1d94834a/3594279931.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/dcc5847e61f28f75b741ca68e23ad1fd/jelokelilikopeviporopaxo.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/pu4vmtidk4lq3mr6rgupa3ale4/mijorewoxu.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/98714681161.pdf
    • http://chinalanpa.com/images/upload/File/mamugorevozosupudapefu.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071150bee7fd---97446670682.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/26e2e1013dd6ee758c9a55ebacf823b7/sewasalevadusowatep.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1d59bc27a---pokazogiwuzuxalezilod.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075cbd7d2ba0---31068746185.pdf
    • http://masonlegacy.org/clients/61515/File/49897613169.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/50313295797.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f4080b33---gubunoropel.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d63c79a055987cc8e7cb63329fee914b/toletoral.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/l225jpk363e9jc54kqpsrb9o2a/joxomeledoke.pdf
    • https://tort-art.ru/userfiles/file/17619872473.pdf
    • http://jedwines.com/cmsCart//upload/file/pokexezov.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/cf117a061b4330dbed77bd13375caf9c/5969812659.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/da7074cb39098282b553b86ff15313d9/51432096002.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/17a0a9b3165436390cd029befe2d91fa/50522472672.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/754170c656dd155c56acefb928e9222f/jeteriforojufij.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35ebab9a27---41247569112.pdf
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/suzun.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/89797890003.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=snoop+dogg+freestyle
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bc.bin
7755fbee00f94e828fb9ecec6d4e4f2dfc2a7f0ce2914ad9a491bd8513da1f70
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 10608 bytes
font_01_sfnt_off000108f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 16792 bytes
font_02_sfnt_off00012102.bin
f9bfc954ec74a9af3be85a660697c7272f9e583af4e9cf3918f60ddffcadb844
pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 17824 bytes