Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a1054f218c0d19…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 18:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0499b608611ea1fc58c0cb13a0ff8027 SHA-1: 22ef51b52aa7f08182568ea0aef4110cebfd63a9 SHA-256: 23a1054f218c0d19d153f8411024e60b293b038a2060167df077e6e66bf0fa3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=doctrine+and+covenants+76
    • http://afgventuregroup.com/cfiles/file/57699764568.pdf
    • http://appletechsolutions.com/userfiles/file/3635672713.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b9d95f61---16081938511.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2296f14e40---80873499613.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b30055d9be8---xomugupez.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/64a8363e7bd280e260d923d8de19349d/42594602184.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f01b972f5---veselovefulavevimixof.pdf
    • https://clumba-indoor.ru/files/files/68147962762.pdf
    • http://vantaibactrungnam.vn/upload/files/89985825712.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f1ca52c3973eff25451b6d8e5810d06b/93878627648.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8d440ab3ff11044b76bb640c8719c617/22622806256.pdf
    • http://chikatere.com/Upload/files/fuwagaraxibagosutakifu.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/wasubeniwagozapun.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/faik04so8id2jvue76vt0p02th/sifusupizadiveroxurowisit.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ak6ns7f4u6ovcpsibd5hk3rh38/50576838010.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5c0008c13aca7f3d15a4ccda919af042/tupibusamanojijefeguko.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efd243aad8---74532122302.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a32dff9c0cc---1486790846.pdf
    • http://isystem.hu/ckfinder/userfiles/files/gagitosemixefazupa.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b14a25fb3---kovojepegipafanenudu.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f71a17f878ccf767ff16d675258d172a/24326661030.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/nasomewegivewoxojafelis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 16792 bytes
font_01_sfnt_off00010616.bin
c5b51c8b9e2470af56a5a309eb22236da1bfae9d5791d00a16f886b66c3d2981
pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 16616 bytes
font_02_sfnt_off00013163.bin
3aa2726d1330ebc56058e3b19770589d2f8fd7e1c7222387a57b5106770a2287
pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 10604 bytes