Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1f5158518f2490…

MALICIOUS

PDF

97.8 KB Created: 2021-09-05 14:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d73dba96ee9805b7f8186ed45c2b0fd SHA-1: 79c27a89d88eaa2b67b4074533a1c7bca278e38b SHA-256: 8f1f5158518f2490c5e50859a71de757440bfd81acf535422d81cab0e80d79e8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//92954181298.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa05c10e1---meruxitez.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/45481257895.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121af0b510c8---fidapafiwub.pdfIn PDF document text
    • http://sqx.cc/upImgFile/file/20210516102154.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17859dbf8---dupatadak.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/7645175613.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210725203433109.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162735920796263925868.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/zimunuzimofi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c51f78c8f---90047565915.pdfIn PDF document text
    • http://texmet.pl/userimages/file/teletofanagexididumu.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/xukamugiperew.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/221ba868887237ca31b12acf7bd8aae4/77811075849.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4a66efca---susamiturizadavunawut.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/dfe15dce03d0f8d0c8c24ba823f9f060/pababaxutubisateze.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/66108755860.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5e192e9050cc59b5ae5157750ad05e9f/fezuwerolivowipotonixat.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ea2c4e41245849be7e824c45c9f257e0/giboduxotumegeni.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/90336618418.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb81c33770---wajurovanesebarumigulu.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/70472779953.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/tojaze.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070334aa56c8---xularukorivovodak.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/34921129692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=derecho+romano+arguello+pdf+gratisPDF 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_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 21932 bytes
SHA-256: 4cbceb70851dc2e75c76018cdffd773da26e6707018e5422cb04b8d65d24027c
font_01_sfnt_off000147c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD7 11168 bytes
SHA-256: 1b49cdaa3ed1185b9acdec3892d878c7b12d02a0a4b45cbd2fa7fef550bfc5f0