Malicious PDF — malware analysis report

Static analysis result for SHA-256 a543f27914d3d667…

MALICIOUS

PDF

87.4 KB Created: 2021-07-13 18:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fda3d0e0ed0fb0749b3c2040c08cb23 SHA-1: d2d796395d632f96d0b77f6a7837114b8b3f183a SHA-256: a543f27914d3d66705c1ec3a4da45b1cd11b79c13d43db712fb7f513163b0550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and links to compromised CMS uploads, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://nomylo.ru/uplcv?utm_term=difference+between+ecommerce+and+traditional+commerce+pdf PDF link annotation
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/kekebeke.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd56e44421---pefapawaritoreg.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/rarrqf6rdvhu6jjv85dagd227m/40499390835.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jofafegubabonezi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607394f123146---15356390047.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/24701527920.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/35410737366.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/dujuletit.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430003332924886.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/98445331601.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/93116882710.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/wukiguramin.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c7695be4---dakediwotuwiwakisezufuje.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/25b3d6cf21d3904f5d799accff1f5265/16574105808.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/zemudufevuvobexoduluni.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/tawun.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a31c6516---69408737263.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/72185062516.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/40831616add3d6e05ed4072f0f4b005e/96148837715.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/99703213934.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/11690437046.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/62325272226.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210530_B8CAB0F383759123.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_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 16548 bytes
SHA-256: 4f38f8080bcdb6376b643ebcb8054129a1ebd5218ee4e68b1e117d54964b7303
font_01_sfnt_off00011f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 10840 bytes
SHA-256: 25a448b9801c822ed8af111392758051b0ab7136f2e4b1168a0f58d4fb16d88c
font_02_sfnt_off000137f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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