Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cf217c91d4993c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 22:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f25b6e05e0206f7d254e352259977954 SHA-1: 15f9377f2de74f2fb4e4165a7fa556451cbd5949 SHA-256: 45cf217c91d4993c51a685b1ca0fc786226f0c395fb32bc3ab9771abe6ad0e6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm with numerous external URIs, many pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links and the overall detection profile strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=hungry+shark+world+unlimited+coins PDF link annotation
    • http://thuocnam.xyz/images/files/xunofizazaz.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/52691612657.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/60965595155.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/jekufatapovenaz.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/ligon.pdfIn PDF document text
    • https://kimcert.net/E/file/zapikikalimaruwi.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631615889.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614223dc2c604---mowuzududigadur.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/dowazovisinemuz.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/10394048617.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/velupopaziti.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/85ee0f43c5295bbc6fd09454b760d357/maxatokupesegamiragazexo.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/89207544545.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/18879716873.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/tovupaguloxar.pdfIn PDF document text
    • https://moolans.com/uploads/files/14049878756.pdfIn PDF document text
    • http://trovas.com/userimages/40265033237.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/wunosusakajofitovivu.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/juwolar.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ff4e4018fd58e1e827af331e5ef2c153/80948881475.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/41118835291.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/96912826947.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/gimeba.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a1ac12912---degoxopobavozenat.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/dekezitejewikuw.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/bosokopaduvovu.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/5604585953.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_off0000d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 16980 bytes
SHA-256: 9a138b14025d613a0fc4a8f31d9ea97b4ae2830a42215760c08463b4eb37538a
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 11200 bytes
SHA-256: c70e788b93a0e3193ba97c489c38c8f295e28f6ffbbd12a1a7c9b4bcc0b3c31b
font_02_sfnt_off0001189f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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