Malicious PDF — malware analysis report

Static analysis result for SHA-256 9faabbaf41a65017…

MALICIOUS

PDF

73.8 KB Created: 2021-09-21 00:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4c27ff05ea5bf67ed6e8e78b9d99ded SHA-1: b0cdd0ddeeb4cd86f08723f822caf0b993a5c4c5 SHA-256: 9faabbaf41a65017f0646597ed614e10a812bdbb53b3f349bf91e45b7593eb18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://crewmak.ru/uplcv?utm_term=new+vidmate+app+2020 PDF link annotation
    • https://cissud.eu/uploads/ck_editor/files/nupuxikesumawebufoporasa.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/96912826947.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/wajutekitubuzezezasopo.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/16988172146.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780b459c1e---89087592398.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/fexakadurosifomuxuxe.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/vijukozinamet.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161381a7f14fdd---bebuxubana.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1538d5cb---fijugop.pdfIn PDF document text
    • https://apagar.cinemadossertoes.com/ckfinder/files/terolurazitogenajo.pdfIn PDF document text
    • https://simorgh.it/uploads/file/38762058136.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138edc900f24---munuteforativukari.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/m49vkbns73iqb5khj5lt5aija4/45965627069.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/3744105479.pdfIn PDF document text
    • http://cycling-software.com/files/file/lugotovoz.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/bowumukafepetasinej.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/wuketav.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/wepaxalob.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/gajisujunenudowatobaweli.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/sugemavuxazivaju.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/pebovaxesediva.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/malizepujedamotizozewi.pdfIn PDF document text
    • http://xn--80aaab5bgii0ck.xn--p1ai/ckfinder/userfiles/files/lomutavijiwite.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/zolekefupozapaxumerete.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/dagelo.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9bf38f58dad3b2b69f17b33ad692d8a9/puxubipepifekomaxefa.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_off0000b6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DA 20096 bytes
SHA-256: e83952034398eeee6509c34bb6990b49d5cd363c8cba7c1b722184d59cfa94f2
font_01_sfnt_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 10388 bytes
SHA-256: 65651ffdea4c6b5a46a61ab47909d6c02ac01f53d3b3ce8d064e9eb53acb13f6