Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42aeccf4e11fb15…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 14:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f148a822bae497d51db4886e9f0aeb7 SHA-1: 8d6a900facbafadce7d8ed53835a19f0925e7580 SHA-256: e42aeccf4e11fb15d3b229438d38b1cfd2a2099111d14f960b57728fe54970b6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates an active component designed to execute code, likely to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://agri-mal.pl/userfiles/file/75556303474.pdf In PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/44225029740.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/musarimupuzemewuvaxe.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2e2598819---nobanonifovawuvadupa.pdfIn PDF document text
    • https://atl-50.com/files/file/nolorenetomaluwoja.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/21928626441.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/88157071017.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/velodokemepisutuxalan.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/rixewisamozowawutimun.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/407646316227c65d04126411f6f85105/47338380739.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/15739213594.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/nulawilukufarosatume.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/xixoruxawizomaxufi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bdc6e687e524143cac143dff0be5b455/33644622611.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/votezibedisesuroxakef.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7edgvtmuaa4cda1cshbh8epqv0/wunija.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/vofojine.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/40840482220.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/56057548423.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/dagezodimujuzizobopelipik.pdfIn PDF document text
    • https://alutat.com/data/file/97003336291.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/12125919875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+phone+performance+comparisonPDF 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_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 10724 bytes
SHA-256: 644751166a8038363dbd12cd4baffcdec8cf6c6f1e6f56b989e48f3d9955d6c0
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_02_sfnt_off00012ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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