Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ef6ecf5e5cd7d7…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 20:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7f7ce8182cb517e9ce727b6b8b62133d SHA-1: 16f116da3be2a5dcf83907583a3035f09de884cd SHA-256: 49ef6ecf5e5cd7d7b152ba2f01b4b2121f61bf5bb8443a044a29d07996b524d0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing multiple heuristics related to link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The document likely serves to redirect users to malicious sites or download further payloads, as suggested by the numerous embedded URLs pointing to potentially compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=fortnite+bundle+generator PDF link annotation
    • http://itcck.org/upload/editor/file/69529832173.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/dedixugonerewaturoda.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613337145dcae---44433440016.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210905012813.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/37716390426.pdfIn PDF document text
    • https://dm288.rs/slicice/file/38375805482.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/lefefebubaxubigifep.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/16859317886.pdfIn PDF document text
    • https://creativekids.abcedukacji.pl/web/uploads/files/zekapebasumaz.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/wixuvulowewujigoviguvomax.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/8158655629.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/78088226847.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fde224247---lajixuzetiw.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/mogomemadawufomexapiz.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/92974692917.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613da81411e4e---pedas.pdfIn PDF document text
    • http://samtle.net/ckupload/files/tikepirunabifufamalik.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/lezusudojofobapuroj.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/xalilejagunetelunimi.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/sanirelufitepujoba.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/sudogolep.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/27689859650.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/3965201142.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/10844044977.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_off0000c173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC173 16540 bytes
SHA-256: 386bcc21c8c89ffba8d3857300e8b435bd841973756cb2534dd2d032449dd32b
font_01_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 10472 bytes
SHA-256: 6e42ca1bd5132cbe700bb1e415bf5af850232695dc0e8e21829a65bcbb4dcb95
font_02_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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