Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a819b16d09c8a4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 05:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 101cb3ccdf567ae5a3c6d113b2cdd580 SHA-1: d63889446c6ed7b389a2ac70015073cd5ab87a38 SHA-256: 26a819b16d09c8a42cb9f131a9651ca3cd6dd1284b12c6b2e0ec59a76d937aa4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to external resources, with several hosted on compromised CMS upload directories. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ghioroiu.ro/sites/default/files/file/nifuxerewodagujuxagore.pdf In PDF document text
    • https://rcot.org/userfiles/file/58134040049.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/soxokuruxe.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/kosifa.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/aad1c33f20b767d27db1ed3286fc9f45/15528788041.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/vuvowobebezanosatesepepiw.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/38556019507.pdfIn PDF document text
    • http://orlickachata.cz/files/files/88217348151.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/xixigotazotumedasibito.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/acea4ce06c0212487f4e8a7a730935c8/gamurovejagikaveg.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/gjt1k73dfbk1516ao56kj33q5f/wuzazaroladodole.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/xekupuzixajomesasibuga.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761f0204db0---18888894982.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/47570779644.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/fulotawumugirazobovo.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/82321c47ae571293601b4b893f7b5c8e/64037789736.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48fb3794ca---tojari.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///79913367133.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/99596542867.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7ba7fa8ad55ae6a6603b1654f618385f/46585590782.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/39222037048.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/81612302343.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/laropumufifigi.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4d4704548b1e184b0cf363b18b81b24d/desedulojugopofoviwuwunev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=diseases+of+field+crops+and+horticultural+crops+pdfPDF 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_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 10820 bytes
SHA-256: b1c6c85df6abfce9775f2f57126c415581619920a208a8b4b86b19beac9c3315
font_01_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 17668 bytes
SHA-256: ee60d0be879cbcbccad480adbe8967888f82786efa6e42856959d680769b6c65

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