Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe08a71900da7213…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 03:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72b0ceca3981ace117df8da728b527d4 SHA-1: 3a71e702ba478bfce631cbd0d3c9fe8c6f643091 SHA-256: fe08a71900da7213bab4ef8c1f167fcc7c02b83fc5e85cdd4ead39a08d511acc
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. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the PDF's structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=how+to+screen+record+lock+screen+android PDF link annotation
    • http://unsersohn.com/images/file/19756633453.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/zufavore.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/pelonuvokixet.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210912095113.pdfIn PDF document text
    • http://konberdbio.com/upload/files/jamejuxefataluwa.pdfIn PDF document text
    • http://consade.com/userfiles/file/nevisiterozavu.pdfIn PDF document text
    • http://letdentalab.com/img/files/38724042785.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210919180650.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc11c3ab45---berumiwomugekivifabu.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/57449514340.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/fimisemuzekakozidepo.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/995b208e0007d494b4106b2e3c348f0f/93295451154.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/8117310763.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9fcdaef30e44f350b204c025108442a0/26374288417.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/87449843688.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/78969730178.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/dumaropup.pdfIn PDF document text
    • http://pronobile.de/catalog/file/dadefepusake.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/jelaxojibagol.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/64501040609.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/92573398154.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/43106085325.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/24691770998.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3041605294.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_off0000aeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CE 10532 bytes
SHA-256: 527abc2845cc383453ade2490ed26a803c605a32aaec1482277c9f8fac791fd1
font_02_sfnt_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 15064 bytes
SHA-256: 09261331362561ff0ff88805a17c23aff8e4a2a9eff07fdb46232b12f9990ac2