Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f816160f7b31452…

MALICIOUS

PDF

104.3 KB Created: 2021-07-02 09:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ebf7f19d7d82249d55638e04c7dfcd6 SHA-1: 218e00fb7c3f64953a2a8c3a32a71a4c5b5cd54e SHA-256: 1f816160f7b314527015a0c3dfd13a731c09b506bce957ea643c0672fd70d6e6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts social engineering by prompting the user to install a browser extension or update. Several URLs were extracted, many pointing to compromised CMS upload directories, suggesting a distribution mechanism for malicious content. No scripts were extracted from this sample, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9602ef527---96914028098.pdf In PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca92471e9b---2363309891.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/36278963800.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/21635889529.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9ae2db3a255648a9ebdb464b5e97c627/15618674725.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609841cc4d7eb---pivug.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/avpba52haf6c7t7jbspm6vs962/jexaboxusojevovon.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/q8c981pon4uqi97t8geiip9bv1/37823883612.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd3b1ef830---wadudupitutegemajirulete.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/vebosanakef.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fc7d3111---noxugafazuroxubigamepupeb.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/80546009700.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083cb00aedd3---81486039566.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/de4376b145601925ceb92990795884dc/85940491651.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c33721e302e---rozuxox.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/22927056102.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021622042225358.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/d8kje9i2l5o17089i5trbr960o/16118471546.pdfIn PDF document text
    • https://arerp.kr/data/file///8218498368.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/gizamujukarul.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/3255519178.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/webexolapikon.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/87a1e07694a9d612841dbf54a87e4982/rinubesukufu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zefomero.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27592d02c2---gitibivaloxowose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=day+trading+and+swing+trading+the+currency+market+pdfPDF 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_off00012aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 24176 bytes
SHA-256: fd57737ce8ce987686e98290d53acce38721e503731d3e77256ca253eafb5dfe
font_01_sfnt_off000160de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000178f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F5 11292 bytes
SHA-256: b81b720054d4fe7a10de4fa6ca08b74ac5cdc11a4242741d9be25f9abf12dc74

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