Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae607c344247b450…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 03:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 924775ce2555c2163aebdd89f2079cac SHA-1: f87c7291ba18a85bf47c69de9a48291b0017b8fc SHA-256: ae607c344247b4508d4b4c2c2eabdcef2d0a354dad751f3b5f232ac8f4054bab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613755994eebe---zarazavol.pdf In PDF document text
    • https://digireg.it/upload/rajomexim.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/suwuliranugaxuxagug.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/difuwodixigamajofibanotel.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/nazupuxabepoloxotipoleju.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/41181833212.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/1472951114.pdfIn PDF document text
    • http://czyxchem.com/upload/files/wetuloximelogepavitidi.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/55650125204.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fac3f33db10c7086d26cc6a323d04629/gumolija.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/dosedopukokulipexopaxeva.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/fikel.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/71503465582.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/dapidukezoladinigiko.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/gufifapejejijazofakagud.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210909221706341.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tnmcmmg1ei4569mgg1gem26m3f/66532280932.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/90717246433.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/sikowigabalukukonojifom.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/78129810010.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/59692857887.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/778c646560a7460405de6c89a02335a2/12580038558.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/fimipaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bt+controller+apk+downloadPDF 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_off0000af55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC767 16768 bytes
SHA-256: 21b99ecc881debd69033e2939a14b5768b092486224ca0e26a624931015ff837
font_02_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 10476 bytes
SHA-256: e47b66ad79c110e31c265c8919d6b7cbdeeebe0a2beceea5b8e613435eb2c23e

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