Malicious PDF — malware analysis report

Static analysis result for SHA-256 244b9348ad157e1d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 03:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0cb9ebaa0c7790e04f628f664d31295c SHA-1: 7dfca1c55add4ba43ed22b951bf8929e8cb31b17 SHA-256: 244b9348ad157e1d602a2dd5a3c25049ccdb3d3e535224a674ca675a228663f5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be compromised CMS uploads, suggesting a link farm designed to distribute malware. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature. The document body is heavily obfuscated, but the heuristics indicate a phishing lure related to game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://gradn.ru/uploades/fckeditorfile/vokizafogasobuju.pdf In PDF document text
    • http://sloplast.com/userfiles/files/91990952063.pdfIn PDF document text
    • https://soechi.net/userfiles/file/34573135257.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/kivotovarawegipesobuworus.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/sobelilogigudesuziwuxet.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210910_00599B0D5EB4A430.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/58975483418.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/tifepugu.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/lobal.pdfIn PDF document text
    • http://93564497.com/userfiles/panir.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/jonokatadugonuziwo.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/xogaginojexanepew.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/32228766762.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/37400501916.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411d6817722---kexidatonatetup.pdfPDF link annotation
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161412bb9efe14---18518838440.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/49705995691.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4582993ba2a0fc9d67f940d8de65347f/85836928021.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/bopawararinegev.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/leviduresevejowubosek.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5b72153bc35008b703070dc402b62544/dikimanijijemivupidir.pdfIn PDF document text
    • http://jsdarvin.com/files/4930679187.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/20999287588.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/19256870840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=max+payne+2+apk+download+for+androidPDF link annotation
    • 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_off0000d039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 10732 bytes
SHA-256: 3938913f0c1d7756fe735774cab8a065fddc84ae305daa132070c3b1e7796669
font_02_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 17548 bytes
SHA-256: d9115fd9ed00979c5f8e60e18c300fdd74491b0a477ab4d810d0bc7eb75f3d81

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