Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e15c455a8e8037…

MALICIOUS

PDF

73.3 KB Created: 2021-09-10 22:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cab38c9a6efc23527765685e925d6d81 SHA-1: 0bf6c0988a0971f7ae3f1243cdb5edf6f22f8b01 SHA-256: c2e15c455a8e8037cf66019a240b126779118e3ee50b2c55e75588b2f30379f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests a phishing or spamming campaign aimed at driving traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=miui+12+fm+radio+apk PDF link annotation
    • https://actsonics.com/uploads/files/202109020450585574.pdfIn PDF document text
    • http://samtle.net/ckupload/files/1492037078.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134051b0190e---84966730163.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/bebulosamat.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/koxakarojaxogex.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109070647246681.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/53348721525.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/rugepemivirimajigamikusan.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/xejurubide.pdfIn PDF document text
    • https://12shio4.com/contents/files/80338118143.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/79364090568.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/tvd2rc41rg0vfgt2g929b6qbg7/melubelovedemilalemases.pdfIn PDF document text
    • https://rajakedua.com/contents/files/69265311395.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/75845461137.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/24333955090.pdfIn PDF document text
    • https://turbooto.vn/upload/files/53066142470.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/59523784002.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/40700882977.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gapurunazusisakage.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/83823340510.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/joruzorozavifubivupu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349aee03d3d---jugedawiwajafus.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/97719229165.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/doroxezesakixexixagow.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/wowokizazez.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_off0000b8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E3 18112 bytes
SHA-256: f6aaa595d00d0c956ca0c4a1c87667f1ff8f909c70a9d4e1d95671a56a4a84b9
font_01_sfnt_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 10468 bytes
SHA-256: c5f037f6171fdbcfc19bad6be6f89e861de4dd96c24dbed2d6bd469a6e29bfba