Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11442548b5cb1f9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 23:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 1a9681f1da2500b9e4cd6f2e85b0bb34 SHA-1: 55fdae335a2a81787132e768fb09fbd582912696 SHA-256: e11442548b5cb1f9f973353c32f7cbb8d8fdfb74fb2d27220ddfd44b6be0ccbe
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including links hosted on compromised CMS uploads and disposable hosting, suggests a link farm designed to redirect users to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern, likely aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=best+sniper+legacy+mod+apk PDF link annotation
    • http://intertribo.sk/files/40357359347.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/13388424583.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/34643539403.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc366a67d---sekubenoz.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/jafawopojarelavi.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/zevanixunamojuber.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/xurebilezugaxujifopaze.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614300f4775fd---64884719767.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/worarimaxevopirafakinuwal.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/jezamepagaxemadonokor.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/28837622469.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nibagowifubize.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/kchetstek3np2obbmsnc79rqo7/69029481724.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/836a8d096a5dde64d4f47a53a4072899/muzolegimiwukafovabizi.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/doweriguvuzugesogijojudul.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9abb4914e---jevisivabaxemirenisu.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/63248141723.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/litalofukupafukeparamiwux.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/19973137126.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/terafewebiximavujugeviz.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/rolijepujuzara.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/63131187578.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/23qmckagscbt8tg1o2f232um93/rugepiwonazavodalerab.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://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_off0000c91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91D 11116 bytes
SHA-256: 1a5aeb11fb41faaabaf2586ac668588b1d37514a5cb1d1aa5a1920df2a85b959
font_01_sfnt_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 19644 bytes
SHA-256: 1a9874cfd69cc29d61b39a9937de337439b5ac291811093b0287514b3c1d5bd7

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