Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf8e36c181d9c44…

MALICIOUS

PDF

105.2 KB Created: 2021-06-28 01:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9e4f7538737f7f8da46d44d9043a3ecd SHA-1: 188a052e2653e727321f7b7230a90244567551bf SHA-256: 4cf8e36c181d9c44e97134c9efb86187b494fc28323c722c7fce281779b8db71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing lures. The presence of external URIs and link farms indicates a likely spearphishing attachment used to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d08b73c5215e798d24e22e3b4e850db3/46010169451.pdf In PDF document text
    • http://cheers-gifts.com/userfiles/78694220134.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf0815529---ziboged.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/vixajiwonojegozuzofol.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609860a3710b2---24661409533.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc5772eb1---65292470738.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/nisjgkt5vn6i2f1o0ej2u6ra08/zewobigij.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/xamomuwudezufobozu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8992b420d18549b1c6f8a78ac462cfaa/zowemeligi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb9eb51ee---zugabipivatadewek.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/99865080091.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/76759456414.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f24dcd05f---57135130988.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/upb4q1dt7cd1srgpra5msis8da/73435388487.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/73af98f4db5583a5bcaeb5ea855bda6b/sadomojebode.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/25fe381687d2bcf55f888f1b2f002b27/rewiv.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/113df42cf7209b615f4c2df0ec6d0c13/zipijelove.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7729315311---miline.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdba159953---11203495829.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4e2668b2db1951ff276de363f6b06a50/45872444311.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a283aa23689bbf43e104b887a22b5a4c/44353909353.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8a672e5f93209cc3e5e63d3f5aad3360/vowifodurobomivufeke.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/98643879455.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/madelejadarumoratevupofo.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/149c6c2701ab20daf14891cf0cea1c45/midonixav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=virology+multiple+choice+questions+with+answersPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00017ba5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17BA5 17396 bytes
SHA-256: 8e05244c895ceb4347ffd381fd3585453d0da08b1d30aa1b8b79d20ce2623edd
font_00_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 2328 bytes
SHA-256: 01d6445636dc6baee4c59df198a314aa7f450502a171fbceb969101b56a9b5a0
font_02_sfnt_off00012464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12464 23552 bytes
SHA-256: e6bf30b5bd018c1803b3f78fa309c00676d5b6be28f1f5ce9e4c8cb243f30668
font_03_sfnt_off000161b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B2 11236 bytes
SHA-256: 91c7cc0fb6d3b52687b58f9ac23dcd96ab735baa7e74f28d3cab7e61e04409ba