Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdcb9cfa422e848…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 08:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1e155a6056a8c9392b46dcf7ec32ed3 SHA-1: 782e865c4aa3d4e852d16cba18b63f4959980370 SHA-256: bbdcb9cfa422e8484c9d8e9064d25dd4c2757bba41aff2b68c3a379210fd23d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=download+file+obb PDF link annotation
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/rfuut9u54kc6oe2r875akul3l8/54369261137.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/56879616594.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/fitanaf.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16142907366d96---79229829247.pdfIn PDF document text
    • https://blugarden.eu/file/sotinumelot.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/55176458204.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/128421184.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/77355149424.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161314f607a78c---xofesa.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/jisibibegomutozufere.pdfIn PDF document text
    • http://uteambio.com/upload/files/26098547935.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac97a5e5e---35174609541.pdfIn PDF document text
    • http://irollee.com/userfiles/file/66064088250.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/ganajebujug.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/65484478474.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/25926163209.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///fufaxavosuri.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/jarikunabozovedez.pdfIn PDF document text
    • http://farmina.ru/uploads/files/sixawobexijugakori.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/kulakixosemajomefoli.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/95690899162.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/puluzojijekumas.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/98744710019.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/powolezoju.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/90263300560.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_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 17216 bytes
SHA-256: 3144a3354983ac19753cc5ee0b1ae49f1b979db71200a18c087e95d65c3feb36
font_01_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 10208 bytes
SHA-256: bebdfa55d84c4cd97d74fc6de988917093b0d2eb3d8d3e996630317e7f294b72
font_02_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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