Malicious PDF — malware analysis report

Static analysis result for SHA-256 88be744df135e442…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 10:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d3dc8a526e7cb6274fb36bff9b71cd6 SHA-1: 3e77d63176d3f7a2e6d1f47769397f8cc660a85a SHA-256: 88be744df135e442a0be45d2ddc792536946d6db957d254303719e8ddd5e206e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) further supports its role as a malicious document, likely delivered via spearphishing (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=learn+to+sing+apk PDF link annotation
    • http://tatugigo.com/ckfinder/userfiles/files/94953902473.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/pifez.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/lixuzeresimazik.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/39115932442.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/41938734212.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/78718889878.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/tosegijeloleleriwojefe.pdfIn PDF document text
    • https://masihpt1.com/contents/files/6645147716.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138367862af7---xutuki.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/55900525392.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e63506d344---38750372225.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614018fa200d1---desotizi.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/99662524204.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/56643113461.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/pipuputiwuxufularalamulag.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/57432812951.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61a83fd9d---sukuraji.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908202647_wnhyli.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109152251143646.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/76560552916.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e36c27a07d---gawobewavuvixokasemab.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/55305445664.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fozobepukofesa.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/xugaraxedufog.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/33149494651.pdfIn PDF document text
    • 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_off0000d181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 10432 bytes
SHA-256: 8a43c2281aeb67f11de8032992dacf40c62a60b47df70ea30b739ea3efb06eb8
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 17844 bytes
SHA-256: 4e5ed80fa7f64bf1adf6e1f681dac8349b5c31446dd0d919c8ad11ae3d4c52f6
font_02_sfnt_off00011731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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