Malicious PDF — malware analysis report

Static analysis result for SHA-256 8957e59586759b15…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 14:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f53c4203d1424c705ae75d48acad6530 SHA-1: f85915ad0de45df2c6e42f1160cfbeddcebc92df SHA-256: 8957e59586759b15762667ad880c3ce91f3c73fdd516ca310e223568b4fb0907
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://american-security-inc.com/assets/ckfinder/userfiles/files/kigefugafonuwokezogeka.pdf In PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/32764080420.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/50198962902.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vowomodexobofevigiz.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/2156036024.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/sekuwelidavixutakimaxuv.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a75a93f15f75bbe052507907bd2caa03/90561248356.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902130814610.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/dinujagekejanivonotes.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/zofinagisutekesus.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/27822945787.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109040359280033.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xagoluxepix.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/musutipoginuv.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/13344508825.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/tipatujebo.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210906095747.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbeabaed58---1878025119.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/jebetedazagorilojid.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134141b87b47---pavikuf.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/tirevof.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/xasunolubixulululowodawa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ccabdece5---bigogorabozazasuvizazif.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46507829168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=basic+accounting+mcqs+with+answers+pdfPDF 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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 11404 bytes
SHA-256: bccf2486ca35cc24a80902bff26688b975fbab2186773c2b712aea0c32f11734
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 16888 bytes
SHA-256: b93a47f7fb155d0c25b33580f88dd95b6e50a931025220110833ee47fd1d2fa3
font_02_sfnt_off0001304d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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