Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef16b939a33faf5a…

MALICIOUS

PDF

91.9 KB Created: 2021-09-14 02:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9ed38fe7d93854e9f9ed8668a77a8c7 SHA-1: aecc33f9a14680d09f38b2fbc7bd5f0a27a376f4 SHA-256: ef16b939a33faf5a3a6a92ad31aef802f5546e3dde13b0bf20ad112cfce22ae4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=xmovies8+free+movies PDF link annotation
    • http://hoshitorionline.com/uploads/files/xewebojalewabajobofujuwo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367764c6b02---niworumoburuvinataxob.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/fujilamafukeninunel.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/846fc64bdc91ddcbbc9153d3957506a5/42580821862.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/segabesudokiwevigezuzamo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/14584c319965bf89df6bd8b66fb25dd0/vatewomufilu.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/51074904644.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109080125192873.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/17070277976.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/pmes4vrbkm9fm01c5tp2q382fk/53461467185.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/77993828148.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109121219226183.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/xukamewexutozarobaferad.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/46459100451.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136af0b0115d---97193897011.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/pawivuzabadopoxepowew.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/88622740201.pdfIn PDF document text
    • http://word.mn/uploads/assets/xazotamibedozuvexilulelop.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/95181256680.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3770b688---falusuzemor.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/peferemenoxolaniren.pdfIn PDF document text
    • http://rvhifi.cz/files/file/31650827198.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_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 10248 bytes
SHA-256: fb6cc9c699803c95db5ba4f1ae786350587967e0d8c5e19aa7fde5fc6bc80165
font_02_sfnt_off000136c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 17228 bytes
SHA-256: 054e15310867f1eb04cec070fb3ed1bb86260c5cd997b1bbd0cb2b03c371eda7

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