Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22e108c6a6cac8a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 06:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aac9a5f66b5af894f66bdeda77d3e2fa SHA-1: 8e0a36df6480b46ce3919217ea790b405ac597b4 SHA-256: f22e108c6a6cac8a7a698a08abfc5bd1dc078fd5b1b3962f3ad2f21c3332152c
164 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to external websites. These external sites are likely used to host further malicious content or phishing pages, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The presence of a download button lure suggests an attempt to trick users into clicking the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=play+store+unlimited+money+mod+apk PDF link annotation
    • https://astoraccessories.com/uploads/ckfinder/files/kodik.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/1238945346.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/jinusibetosozavorumu.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/9947150347.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336aee6b20b---mubum.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/81037207899.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384fddcb8d4---runiraxusolu.pdfIn PDF document text
    • https://cristalensi.com/public/File/ribipomutexozuwogilut.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/movosasoda.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/710c4fd96dd3adbd0c1b384677dc2392/negef.pdfIn PDF document text
    • http://dolonchem.com/upload/files/mamumoroxotitusaperu.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nogudalujefom.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/55381105951.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/nofogofozamimov.pdfIn PDF document text
    • https://andana.us/files/files/mesenulonujeso.pdfIn PDF document text
    • http://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/71566352235.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/wakoloxuperekizaje.pdfIn PDF document text
    • http://ave-france.com/pics/files/wozopigekumux.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/48742785919.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/28063809569.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/37153633414.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d829f1fe8---25959952121.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea88a2a0ab---fenopisowumunupaju.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_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 10860 bytes
SHA-256: 976f35f9238314b5601af3ba2b1c83f31406ca2fe9bcfecc5bb439d4dcea70a6
font_02_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 17080 bytes
SHA-256: ff4c6c81220639219d2bf66f810dc8ee85bbe363f1d7b3201fb900b765ddb08f

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