Malicious PDF — malware analysis report

Static analysis result for SHA-256 1520dd7d93850694…

MALICIOUS

PDF

68.0 KB Created: 2021-09-20 08:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d192ad244f45bf91b3d2333c4f5fa12 SHA-1: 90d5a7f7b146fe79217b08952c2f6450ec7a64ed SHA-256: 1520dd7d93850694e6d8ea6e569f16e62a9a767877b78aa96c36cdef2575b113
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as a phishing lure due to its structure, containing minimal text and a single image designed to trick users into clicking a malicious link. The document body is heavily obfuscated, but the heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 68 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://jordanadams.com/ckfinder/userfiles/files/92203661801.pdf In PDF document text
    • https://happyfun.tw/uploads/files/202109071808215686.pdfIn PDF document text
    • http://wixoon.hu/upload/file/53998846964.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/tokekiduposupulufutefom.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/65851587345.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/muwexiduzimelowigo.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/wipadonujolubes.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/sibajununox.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/de89ce4526e964f6c2a7b79f7846b0b8/zurobegakexewitizixowi.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/51854922827.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142f9a272d53---vikazami.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/kevasivazafo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613694cb735c7---lenafutudinapaxiso.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/mumoxowesebufasofola.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/9161846714.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/fujetezelulidubu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16142dc66025ae---15411610928.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/47859168239.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/92054269369.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c13cc3a9d---biwesopebaxivudigisa.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/33024988854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=xmeye+android+downloadPDF link annotation
    • 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_off0000afde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F5 10352 bytes
SHA-256: f7740b539bdf3ed5c83da1de7e4e485dd2cc6336d08d65d27d34b697a477243a
font_02_sfnt_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 14164 bytes
SHA-256: f18055fbfc4e6ccba70c09a5184097e9f63b05ee9a1026778bb04430d59fbf9e

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