Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a204111abae445…

MALICIOUS

PDF

72.3 KB Created: 2021-09-29 13:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a1a716bb237f31045b5fb93b0c1c9b30 SHA-1: dc29e2311e9bb174d809c22caf49d2e531c622ad SHA-256: 61a204111abae4458df5827e6a5058519248f1004b97b4af264643edbe6b3184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://medvor.ru/uplcv?utm_term=sms+blocken+android PDF link annotation
    • http://savitaco.com/uploads/images/files/183938562.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/fesemefuzizi.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/59753380446.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/sanusumamajoxabanokigixa.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/kisufetos.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/50518151710.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e729db33d6---nisafutimi.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/79978937645.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/balujepojuwikupawekuf.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/xufemafudulijak.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/40972408544.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16151d5fc52bf5---gorotugezefij.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/12861947756acc205a1d4bcb2fedccee/borewotazavesonamivujifif.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/278403037.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/10130407304.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/9166554067.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398358a50ae---jukadajesudaxarawonaputo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wolugujivumot.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/14491559939.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/52376bf23cb54b62d5f7952f75ba9d65/40925813912.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/mokok.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/78889411850.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/27037102160.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/c55bee0159f5247f4ede46e265723bf7/fokewulakafudipaxak.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/giwuxuv.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/pofemurepar.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_off0000b5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F1 17364 bytes
SHA-256: 6505a9c90675a690d1814dff7acba3a9814cfe6e80ae46f1e0c285c06451dd90
font_01_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10740 bytes
SHA-256: bac915e8eef7bfa7b1ff47f1f4b48e7927647b549d14caf7f446d967eb778a1c
font_02_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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