Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a49f761b1ce5d99…

MALICIOUS

PDF

79.0 KB Created: 2021-08-29 18:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0e36d9e7e958365bea14eb239330151 SHA-1: b429bcd73e5aa8c4ebac0eba4412ecf87d6773e3 SHA-256: 5a49f761b1ce5d99931f844bda2043bf1cba31c1254736285fd68a44c3d82099
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The primary function appears to be redirecting users through a link farm to a final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://oniceh.ru/uplcv?utm_term=advantages+and+disadvantages+of+plastic+containers+in+pharmacy PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4efe3cfe9---13146097697.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/masase.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/satoma.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/46772878997.pdfIn PDF document text
    • http://jp-cable.com/d/files/mumukonuxikil.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/guvamuwolivulujatofatuvu.pdfIn PDF document text
    • http://snsi.jp/image/news_file/loluzomoruwifononu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c5680194333a7fc7d3e7bc4dd57b17d7/pajofusot.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e5b604fc---vapuduwupikanozu.pdfIn PDF document text
    • http://maygiaphat.com/upload/files/2813896820.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1a390aeda87d451ce5912ff726e7258c/47261246120.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/juxuvabilusidezetutetad.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb6234d68b---18479007484.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5324564d7b---sajupijujigi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be4a8d77b---mazinizuluwisilikuzimamo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e352c12a1a6---8705160940.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbda549f4f2---wanalugefavemapuximidega.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/waxuma.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/gevosilabowolon.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202108210403594333.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-25/20210625221721403020.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7c8af44ac72e98d2a54f15d7382be8f8/tejuwevezumodo.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/kedesunuwitexabevije.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/vabupovidofutu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/lkkp3pmnlui8juklqughhj8rki/20521057961.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099af34c1874---xavizegepanisupukalodi.pdfIn PDF document text
    • 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_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 15376 bytes
SHA-256: 5eeca37b06cb2a97729260d5a1d865f7080ab0d71a9fb65b83b2a17b12448903
font_02_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 11228 bytes
SHA-256: 3c90e2ebf14a4d998cac98844a5e32f134a2a4dbc61ce43a4897eca9bbef25ab

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