Malicious PDF — malware analysis report

Static analysis result for SHA-256 4019b833f2be3b84…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 01:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81828720da49ae15c9700a9dfb923bcc SHA-1: df190adae95d07111464df7c456eb562b3ddad92 SHA-256: 4019b833f2be3b846d8516987a570718473945922a9e8524c932a02ab7b1d427
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=apk+emoji+iphone+for+android PDF link annotation
    • http://optometrystaprzemysl.pl/userfiles/file/lidubiwuvikabanipor.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/89553772875.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/roloza.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/mowigivaviwisi.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/30501915465.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/52362263016.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210912222331.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/19005996329.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/dirimin.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613964255ac02---zukoni.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/77513342877.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5m11j8sup80bpqaq1mds6l0rb1/fepexoxaganepunesepi.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/81192299351.pdfIn PDF document text
    • http://chicopharm.com/upload/files/newepivaxamatodotoguzof.pdfIn PDF document text
    • http://olympusflights.com/files/files/73476270133.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/50092145305.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140eec54a592---57075671197.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/munafidudotiropipi.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/8179434911.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/93801615716.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/pewutakasa.pdfIn PDF document text
    • http://e-menu.hu/editor_up/rutujedewatabozaniro.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_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 10656 bytes
SHA-256: ef133b88c65489e020040bb07b2ad63584d2ca8e424d16ac413c261273ab8a93
font_01_sfnt_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 20700 bytes
SHA-256: d03484f8b99189be6f6942d027375555e550046e7678bd6e7d28cf5746efed4f
font_02_sfnt_off00011aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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