Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48bd580cce6365a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 15:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5e028d2715a3aac10a6b05585faf421 SHA-1: 901a65a07d09339a2edb1ee15fa5336cd03c7c58 SHA-256: b48bd580cce6365a26bfe47ba3a735b1546245ab44cefdd8a90e0ff31b50b0a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format suggest potential for embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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 http://snap-drone.com/userfiles/file/xuzokogitoxobomoxoxib.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/75537244828.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/93c964cd9529db84dc604c3c8d0f4133/vetiwibefutubabijapabi.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/motusajof.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/39652016765.pdfIn PDF document text
    • https://panoramabyty.cz/content/radetip.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/gipasowakabusatiwow.pdfIn PDF document text
    • https://maturana.cl/upload/file/gibatowimux.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_ED0F0A9C9FE8B7EC.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109191903369916.pdfIn PDF document text
    • http://chongros.com/userData/board/file/sexuvukukizamemupur.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbbdcf55b---semaretozawobor.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/19097475512.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/vajolabagitavixiz.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/1261641883.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/99899531972.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/20958409632.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/95351858399.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136f53188cce---ranitupujemuw.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/vimemapelajefetuxigin.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/wirijonowidozes.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/12865019706.pdfIn PDF document text
    • http://hbaoge.com/upload/files/lebabuza.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/miraxekal.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/5v7fe02egsr7sv5pa8tfrpcoie/gulomimuzuzasilofod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=apps+to+watch+free+tv+showsPDF 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_off0000b4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AB 10468 bytes
SHA-256: d9847156e99a8d3dfbab921b5968e78444717e006d0259e6d38d2a8052961852
font_01_sfnt_off0000ccbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBE 18788 bytes
SHA-256: 15c0bc28b3079af59c29dd316abd3aa8074062471cbffe6b9e4eedb7c83c82f9
font_02_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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