Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceef8fadacbed429…

MALICIOUS

PDF

84.2 KB Created: 2021-09-24 03:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97ad19bd86b9d3f36074a19b663519a4 SHA-1: 9741f086863f0e5baad75f273343733e1510e1a2 SHA-256: ceef8fadacbed4292c89c0a52e5da2393cf02f2b7429dd06e2459db822f830dd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised CMS upload locations or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://dogomanhnghia.com/uploads/files/3714221645.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8abe79d4540b48166f43c1cd233a68e7/6587435003.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/norezitozove.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/98249888547.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/77824907367.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/9035423783.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/novetafi.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/dirumab.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210911091800_1483677916.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fuduvepopatexelezopon.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bff8b8170d---zugulovozazikeku.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/7ab037e49cbbdadd0dd3691828ccc94c.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210913_852C93B4392803F7.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/fivemepulexeridolotur.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/panulutesuzezoziv.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/tamazulifeloniruwaz.pdfIn PDF document text
    • https://tpk-m.ru/files/file/kalifibog.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161453e7702fd2---lizexavobexu.pdfIn PDF document text
    • http://perksys.com/userfiles/file/67385315129.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/funapuguxapalugamew.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/79384463912.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/88338086067.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/zeveboga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=optimized+parallel+space+for+gameguardian+latestPDF 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_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 18344 bytes
SHA-256: f9229fe5457a92a28c64ee4d13df91c8889e97286a9232dc7475b342e3728b25
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 11148 bytes
SHA-256: 2c45198de3f2c4a75fb66bf29e143cfe36e458f432258ec3b82de6c334fa7db6
font_02_sfnt_off000128a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1