Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb94b469041275fa…

MALICIOUS

PDF

70.2 KB Created: 2021-09-08 08:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4fe7256fdd308931bd24b4febd92e855 SHA-1: caab484076ff1c3e3deade8ec372df00c965d522 SHA-256: cb94b469041275fa23a4e47c40d619950ab17c8fb8bdc7a026e563f68a783a24
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing lure, utilizing an image-based design with clickable links to external websites. The heuristics indicate it's part of a link farm hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=daikin+inverter+ac+error+code+pdf PDF link annotation
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/74b5ac295072ff37c07fc34a2d5307f2/nesozakumu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/vn9e7blghjv0afkhimq8na2op6/39053912518.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967d5a78877---72456079497.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4c87248abc1e5b996eecc52cc68ae88/lutuxasupekavitazajeja.pdfIn PDF document text
    • http://wernitznigg.at/files/1320941135.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ce32fe96b666805dbfcf71b957ada790/xusun.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/4793545453.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/87858907020.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/zogasogir.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/kaxeped.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/sewus.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/81884798836.pdfIn PDF document text
    • http://dogable.de/userfiles/file/16890817778.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/sowonowuluvewapazonal.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e3e4dd585---23654373836.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cba359bcb---bikorar.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/luvetevezosi.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/57338573574.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/13021637715.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161084dfe1ac2c---57747063303.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/wokozoroxikivetafawelive.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/masanukaxedomega.pdfIn PDF document text
    • https://matrixx.lu/images/wafowarofili.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_off0000b72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72B 14188 bytes
SHA-256: 34efefe21d1eb8f3e75599c5dbbd4498cd0013fc71a8738b0c0fc76e7c08aa59
font_01_sfnt_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 10560 bytes
SHA-256: 1614ea3d3ce3ea577f66758126b46f7c59b2fcb67a4db247d2902a83b69954b4
font_02_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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