Malicious PDF — malware analysis report

Static analysis result for SHA-256 635dbfe5503c894c…

MALICIOUS

PDF

89.4 KB Created: 2021-10-21 20:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d1d3b4335547b3abaddf80ee47747dc9 SHA-1: 1aa10735e2bf5dddc1a30cd70f0af2a24e2562d4 SHA-256: 635dbfe5503c894cae09e9fba35127e04b0056c4208bcee81aa1d7c2b08a4ab4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ever-progress.com/upload/files/ramono.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615997cd34649---kaxebijopunopimemikikizi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab2e9d6be---rikalavefanoxasuj.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/losekifeleralekogelipu.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/30196015605.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/64953585388.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616aa226b5e50---lekesagebenade.pdfIn PDF document text
    • http://domuran.pl/files/file/jokuxugugabug.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/1680406361.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/18317156924.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109221616555115.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/wibimusuzogaxogojoruwel.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160d9ae2773e---nulozeravudazewedekezi.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/kigapelebudiju.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210907030624.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/nozinoxal.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615e174f73a42---dowapevasabig.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/9ed51cfb08e9860eb36c4954eaed95f4/jagarisuvezigum.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/28421490638.pdfIn PDF document text
    • http://polletnv.be/uploads/files/zejugop.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/redudirika.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/8077830811.pdfIn PDF document text
    • http://okun.su/upload/file/46976547095.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=red+breasted+sapsucker+oregonPDF 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_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 10928 bytes
SHA-256: 0ec3926a285db2d048bc8bda9041b18cacd53247c5b70da9d08b73b050830c6f
font_02_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 16668 bytes
SHA-256: a7b176f4551fbfc6316cc6e3a3de0d4814b18e7699b3d62952198a20839b1213

Open this report in the interactive analyzer, or submit your own file for analysis.