Malicious PDF — malware analysis report

Static analysis result for SHA-256 e972d6ac39bec468…

MALICIOUS

PDF

93.8 KB Created: 2021-09-22 12:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cbda876bbcd68fbdb9d24167c66b1aad SHA-1: 2926ff248cc64ad234d145623a7f8b656f007d08 SHA-256: e972d6ac39bec4689aa5cbcd7ccc3581bffe10c15ee3a8b41aeec1d60890f02d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://bertrandetgastineaudesigners.fr/userfiles/file/xupojerovorawaf.pdf In PDF document text
    • http://hagelkonzept.de/userfiles/file/penexevesej.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210918035122.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305ce7db23c---xopevamitagivew.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/wavixopadoxebira.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/78667158477.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wuzakutadumaxe.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143e65d6457e---fufejokojizobapaverogopi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f965d8d4ac---puwaferelim.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/15052021336.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/mepopufikuvoniraxu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b5adda5a---zomafujoriv.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/zomaxefi.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/lavawajabafupiloj.pdfIn PDF document text
    • http://strandedtattoo.info/file/99481072254.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/11742504023.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/zowitanafiso.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210921083626.pdfIn PDF document text
    • http://centrons.com/uploaded/file/361513470613ec1271d447.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/59265936576.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/27350540026.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/26964501172.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/77476447377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=leo+privacy+guard+old+versionPDF link annotation
    • 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_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 18372 bytes
SHA-256: 8b2520fe5c800ca5fab016033bdb86783bebdd5a0a0a7c07b68465390c0d388c
font_01_sfnt_off00013931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15148 10828 bytes
SHA-256: e69a470823a533e387671fd375442a3027f0927aa47c8cef0c9d29fa522de5ca