Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bfb19ea7199134…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 03:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32dd02ee314252997a7affe5af6e0f31 SHA-1: 16b39d99d67b8ca7c4bb04da69aec28af2868540 SHA-256: c1bfb19ea7199134834dd9a1cf090e284daf096e188af74cb810ab86ed033aac
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests it functions as a downloader or redirector for malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=my+hero+academia+s05e13 PDF link annotation
    • https://ssmavidiyar.com/public/content-images/files/guzubilifefixuzarujox.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/rexidezifivivitaxup.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/nalabimizewos.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f368083b9a---27642867286.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/20428529751.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/73497310300.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd23bc0019---20605802462.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161359e80f35b3---nuretimo.pdfIn PDF document text
    • http://355353.ru/userfiles/file/wubimeripeb.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/mamusufemusafezu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee43ea2f48---nukufuvegazotiva.pdfIn PDF document text
    • https://paperland.bg/uploads/file/56284872293.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/belabasuxuxoremo.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/57591408735.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd9adc7546---51736251302.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/13113198506.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/perilaz.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/27248045711.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/7852589630.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/17499785536.pdfIn PDF document text
    • http://dges.in/userfiles/file/697340771.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/6248147178.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134f9981070a---wegezafezemuliloside.pdfIn PDF document text
    • http://kccmaul.com/files/files/38333645230.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_off0000c90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 18468 bytes
SHA-256: 4b3a3840b86a64c72d7fc3d57eb5798ec5dbe644cdd3b472b3c03fc495f3635b
font_02_sfnt_off00011167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 10976 bytes
SHA-256: a1bd31eb909527845bc4e477b313ed166c70c9e7bac8ea5307637a208d872593

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