Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd177867d9836c27…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 00:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b3a6fb4e51b0e63ff02e51033033041a SHA-1: e7d11576030f7469a4196170298b284526994dd8 SHA-256: fd177867d9836c27b05233da1189bd7a01e1575bdad811367ad34cdc8ce13fe0
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such hosting for link farms, often associated with SEO poisoning or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://irlanc.ru/uplcv?utm_term=where+can+i+watch+the+ring PDF link annotation
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c253bcfd3---pugokurolekuzejopamoxof.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/nijugetadojubajeleka.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/tibonog.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210921082422.pdfIn PDF document text
    • https://umartravel.com/files/57984092830.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/xamedenizabuta.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/kirubaredalonabukol.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/jozuwunano.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/u6ue4nht06npo63fhmtvoe6g6b/gibubotuwusexisuseju.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/melokapezeri.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109151714466628.pdfIn PDF document text
    • http://prestopc.it/upload/file/87050209447.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/kowakikigawar.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/65594892283.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/jadowatokiposeti.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/tetef.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/rujofi.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/lifererusoxu.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/10177659242.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/wimuwojopunima.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/13588706660.pdfIn PDF document text
    • https://salwangurugram.com/files/vejosogafejopis.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142309f3ffbc---63222524807.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ffdb9728f---xogonitonejikesisap.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210913223743.pdfIn PDF document text
    • https://iwistw.com/upload/files/20076915197.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_off0000b2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A6 14864 bytes
SHA-256: bb562e4fa7ffa05bd45a70c2729dd89d6eda25bc35052be71751ad172cb0239f
font_01_sfnt_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 10252 bytes
SHA-256: ac0ad038668f73ce6f528ca1f20a03f3c72fdfa4920094c6657bec1ea2f17fb7
font_02_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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