Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaff741be9025c59…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 14:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e7c5ae616a9cf47cd94b5d295ac34589 SHA-1: 94f910e2604f114875ccd4558820d0539266e367 SHA-256: eaff741be9025c594dccf6d89cc20d4240ffe070014d44d72e608eee4aef445d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm used for phishing. The 'SE_MFA_LURE' heuristic indicates the document's content is designed to trick users into approving MFA requests or entering one-time codes, a common tactic for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://indiantalentjunction.com/milan/media/silevevanejirewijodapusi.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0675a5070---kubopegiw.pdfIn PDF document text
    • http://htwy.com/upload/file/69818949414.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/vapeziwimiwogavasap.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/49263150493.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3ccd4bffde1q4464e72d1tp2fq/63667073031.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/15463842015.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/85555619121.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/wakelupavupukurenef.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/41147837335.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/42247325409.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/40750094417.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/buxolilimerelari.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e949688d8e---22576462488.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/189d6cdc0c0c43e05947baa8e876bf87/vizud.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/nujutipuwexep.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/78572979593.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36962541859.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/mired.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/tewawiwadoba.pdfIn PDF document text
    • http://hak-al.com/resimler/files/pavulerovodumugifibezom.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f24938af40---tamigu.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/gadutafoxereti.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/20500430710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+archive+movie+appPDF 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_off0000c96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96F 17464 bytes
SHA-256: 6bfdb3dc47111896965835e1a78eadbc333d31e015f6be9f7ec01d900772a6cc
font_01_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 10252 bytes
SHA-256: 724249168464b0462f2076e672d83794b7befe83dd0cadb0063fc84be402e0fb