Malicious PDF — malware analysis report

Static analysis result for SHA-256 b349cee0de8882e5…

MALICIOUS

PDF

92.8 KB Created: 2021-09-06 19:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3011a1731ed4983573e04356efe08c5 SHA-1: 7baef8ac7b12ef6c7a113d674a74d5320322d4ea SHA-256: b349cee0de8882e500350ca627a7a13268ad3ae040f9b4d3c9f4ce6f8c475afd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=spanet+sv2+manual PDF link annotation
    • http://kiko168.com/UploadFile/file/20210822074806880.pdfIn PDF document text
    • http://fitviewer.biz/files/file/fomobonezorunirejoluzup.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec952b52aef---30657013452.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/55822685226.pdfIn PDF document text
    • http://africareview.in/userfiles/file/9981918844.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acb85b5d474---lagepawetajulike.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609858a541ee3---64627079233.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/75263325076.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/dakimulidadika.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/52093338189.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ed168353752dd8eee936686c29b3b836/61918421813.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/xexojinosi.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/mivosisofelaz.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/mapepafafax.pdfIn PDF document text
    • http://dgjst.com/upfile/file/bekuxipowi.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/podafuvuramemegovaxuma.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/21250710465.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/jusejutipimu.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/38546479673.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/43206360268.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/14966038946.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/91838371969.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_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 17700 bytes
SHA-256: f44af6a9fe062b0f119fa49a29adbb1fad12424308b877357786dd566fb28e58
font_01_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB8 10464 bytes
SHA-256: dc149a14d2e16050c4c0f6de2822e93f8a9c05b27d527870481a21cb95707633