Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14b3cc9379ef134…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 01:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd7198cedec4ba7dbdb899ff287a6471 SHA-1: 67ce5507877ec87ee2b6ae359a94e3d3a6c71585 SHA-256: c14b3cc9379ef134e2f7f16e19baac57b2fff743d603380888565051fa5404fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=vocabulary+activities+elementary+pdf PDF link annotation
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a4b3950bb---81333210045.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/fadirewug.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/13395689507.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160798025b2386---mabamipitezuvegevepibak.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/pedamazinaxon.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/16181355662.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/suwimezulu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02884a32a---15713165544.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/8165527407.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b339216241b---44061653553.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/65111248613.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/kawiselobajenipakejuzali.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/solakatazipelisada.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/16997852194.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/35960489972.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38ba2fa9a---55571325650.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/8996316493.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/19183058386.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/55269980292.pdfIn PDF document text
    • https://fratellifurloni.it/file/47725454385.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/74900403582.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/70330862425.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/giwinebididesukipeba.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_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 11168 bytes
SHA-256: c387d3a23569b7daa46b0d2015bf623c31d2fecbce43dd658601076a9c57386f
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001177f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177F 19952 bytes
SHA-256: 8d2185f45dad0c8a54bcc835fe64fe6e4bd038f9d0dd3a9f3c1c1a5508bfa3b9