Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa0dbee17e6e25b…

MALICIOUS

PDF

84.7 KB Created: 2021-07-17 22:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a46c61c449bf376ae637b1835a6f950e SHA-1: 68f0419ee4d757e3f10577bc4ce8845dd202a694 SHA-256: 3aa0dbee17e6e25b1180ae0aa582ab4dd331098e61c32ec86e532f482d228005
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting domains, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99a381155---wafatugerodexukazarugim.pdf In PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55f49bb16---33707595866.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///jizurogulimore.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tde73qnipdfakge9h45cntis2g/narizodepoxakep.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bc69e4b761a13b5d1d9ff093d8681ccf/bedafekuletuzefuruk.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/58852136258.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/dafaragudokewok.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cf1e5utrh6oj9qhuh4u4j1uvd1/geketutozexi.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/6271494697.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/mefidegizoduxafowobijega.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/wefosaxogomuxobovusowuvuk.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094da56a0abe---bitetufizupefunubelida.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/sidiki.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/96433600665.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/84597941363.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/xunavoboturatiwemuwexefiw.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ae5df3a0---posunogonaf.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/difijubudedire.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d9550b644064ca903aae995e267d8984/80848889032.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/36962141635.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a80768f52---73142294280.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fba2840c4a---65414779039.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a756eb04493---5067492862.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/hjern7rhj28kgcu83e31nt98p7/88146209127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cloud+run+for+anthos+pricingPDF 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_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 16960 bytes
SHA-256: 1b05fa1b01c24622d797af75d06f27445c2b0ad4e373c5b8c88bc1e51b76897d
font_01_sfnt_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE6 10900 bytes
SHA-256: be7c9b2be7a2422d604a1bc6046b8176e5ffa9816f4e1ba7b6d3a9055769a294

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