Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bed5c713c92d7c7…

MALICIOUS

PDF

80.9 KB Created: 2021-10-14 01:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3e17cc43c4460ef04d1881d225af8f29 SHA-1: 23b02d582dd1c8d83674c5c5d31a0d6f2d3c2341 SHA-256: 2bed5c713c92d7c7cc3551a0605e3ebb4db6d67baaee2c4f52f6d0d053523bae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://coretry.ru/uplcv?utm_term=couple+pencil+drawing PDF link annotation
    • https://gberwanda.com/gbe/useruploads/blogs/files/zawesugugoviwumonevadi.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/fawexu.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/53801713815.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/740e1bcb4b55b0f9cbc93d95c0c87239/16682643805.pdfIn PDF document text
    • http://thekkadyinfo.com/userfiles/file/tudololejewajogulerawuwi.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/92732371301.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/84378720281.pdfIn PDF document text
    • https://hab.erdenet.mn/userfiles/files/xuveweraxunibulosuko.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/99026623564.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/96913231564.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135c85236e59---xosekojaxageles.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/23991768194.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/93161763115.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/wudubesufumejinawuk.pdfIn PDF document text
    • https://kueapem.com/contents/files/44760718550.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/53973688277.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/10/202110121246097367.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/9006254964.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/tonob.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jekorajo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615ed9efb0c1b---rirakanozot.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/86809414211.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/38152542154.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_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 10640 bytes
SHA-256: 5c9ad04e37c105ef7a8cde5dcd96d55305ab201226e69e8fd62ec539d34ff2aa
font_02_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 17748 bytes
SHA-256: 9f152561c2c6e9b4b0d8ba405314a3147238a5ab816d63d16488e49bf9b17709